Dada logo

Welcome to Dada Electronics Australia

Dada Electronics Australia® is the Asia-Pacific distributor for Dada Electronics Europe of Belgium, also represented in North America. We have over ten years' experience in vintage hi-fi repair, with hundreds of satisfied customers in Australia, New Zealand, Japan, Indonesia, Malaysia, Singapore, and elsewhere in our region, as far away as Vladivostock. We have 50 years' experience as Quad listeners; 30 years' experience as happy Quad owners; 20 years of performing classical music at the highest level; and a lifetime interest in hi-fi and electronics, including stints in the music and recording industries. We specialize in restoring and improving the musical performance of hi-fi equipment. Dada Electronics Australia is now expanding into repairs of other hifi brands, valve guitar amplifiers, and certain Tektronix test equipment.

News of the day
Dada Electronics Australia is open every weekday from 10am-6pm AEST or AEDT as appropriate. Visitors by prior appointment only please. We are usually here, but we do have to go out at some time nearly every day.
Dada Electronics Australia will be closed between Christmas and New Year, and from 21 January to 3 February 2019 inclusive.
We give out a lot of free help over the phone and on various Internet forums, in the form of buying and selling advice, repair tips, suppliers, part identification and supplier catalogue numbers, &c. This is frankly against our business interests, but we do it anyway. To help us continue this work, please consider making a small donation. All funds raised in this way help us to keep helping others.

Contents

Vintage Hi-Fi

Brands

Dynaco Leak Quad

Quad repair in Australasia is only officially supported via the warranty agent during the 12-month warranty period. We specialize in Quad equipment of all vintages back to Quad's own beginnings in 1936, in accordance with Quad's own factory policy in the UK. We started down this road merely to fix our own several generations of Quads, being unable to find repairers. We are also experienced in a number of other well-known brands. We also specialize in valve FM tuners.

We offer Dada Electronics Europe's standard, fixed-price servicing for many of the solid-state Quad hi-fi units. These services include everything required to renovate and renew vintage hi-fi units and make them ready for another decade of pleasure.

We have for many years also offered fixed-price servicing for Quad valve amplifiers, preamplifiers, and tuners, for several other vintage brands shown below, and for almost any valve AM or FM tuner, subject to availability of service information.

Services

Our fixed-price services are designed to cover about 90% of the faults that normally arise over time, such as increased noise levels or distortion, noisy controls, poor channel separation, woolly bass, etc. This has been borne out over many years of experience and hundreds of units. Any repairs still required after completing the service are charged at T&M rates by prior agreeement. Service prices do not include transistors, valves/vacuum tubes, lamps, or other components required to correct remaining faults. Servicing typically includes:

We will also recommend sources for valves and cables as required. We do not supply these ourselves in most cases.

Preamplifiers

Leak valve preamps RCA/PA/U Preamp Point One Preamp Varislope Varislope II Varislope Stereo

Leak released an astonishing number of valve preamps over quite a short period of about a decade, often having four models in production at the same time (Point One/Varislope and mono/stereo). See the listbox for chronology.

They suffer from enormous output impedance due to not having a final buffer stage, which severely limits the length of the umbilical interconnect cable; and from the tape-out being taken off after the tone controls and filters, and the balance control where present, which makes it basically useless. The design before the high-impedance filter stage and balance control is elegant, and economical in using the same gain stage for everything from 5mV phono to 2V tuners: however this inevitably compromises the distortion performance of the phono input.

Not all of the Leak preamps interconnect with all the valve power amplifiers, due to differing umbilical socket connections. We can advise on or modify the umbilical cable, which Leak must have provided in different versions, mutually incompatible. See the following table.

Leak Umbilical Cable pinouts
Unit 1 2 3 4 5 6 7 8
RC/PA, RC/PA/U, Varislope E HT Heater Heater Output
Point One Output E HT Heater Heater HT E
Varislope II Output HT Heater Heater HT E
Varislope III, Varislope III Series N, Point One Plus, Varislope Mono Output Heater Heater HT E
Point One Stereo, Varislope Stereo, Varislope 2 Stereo Output L Heater Heater HT Output R E
Point One amplifier Type 15, Point One amplifier 25W No umbilical socket, only a meter socket
TL/12, TL/25, TL/25A, TL/10 E HT Heater Heater HT E Input
TL/12 Plus, TL/25 Plus, Tl/50 Plus E HT Heater Heater E Input
Stereo 20, Stereo 50, Stereo 60 E Input R HT Heater Heater E Input L
Source: published Leak schematics. No responsibility is taken for any errors or omissions.
Quad preamps QCII 22 33 34 44
Quad 22s and 33s often require replacement of panel lamps, not included in the service but available for a small fee. We can adjust your Quad 22 Phono adapter can, 33, 34, 44, or 66pre to match your phono cartridge exactly if required, for no extra charge.
Radford preamps

We have serviced all of the Radford preamps, from the valve SC22 to the solid-state SC24 and ZD-22, the latter being also built into the HD and ZD power amplifier series. They are all remarkable, especially the SC22, which however does exhibit a not quite flat frequency response 20-20kHz (±0.3dB) due to the tone control section design, and not startlingly accurate RIAA phono equalization.

The umbilical cable used between the SC22 and the MA- and STA- power amplifiers is wired as shown in the table below. It is wired 1-1, 2-2, 3-3, 4-4, 5-5, 6-6, 7-7, 8-8. Please note that this is NOT COMPATIBLE with the majority of Leak umbilical cables.

Radford Umbilical Cable pinouts
Unit 1 2 3 4 5 6 7 8
SC22 Heater E via R42 56R AC AC AC=3, switched HT Heater
SC22P No socket: this unit is self-powered.
MA series Heater E AC=4 AC AC AC=4, switched HT Heater
STA series Heater E AC=4 AC AC AC=4, switched HT Heater
Source: published Radford schematics. No responsibility is taken for any errors or omissions.

Power amplifiers

Quad II II
The Quad II is one of the most sought-after classic amplifiers of the valve era. We have serviced many of these and can also replace the outmoded mains input sockets with IEC sockets.
Quad 50E
We have serviced this fairly rare model, and we can adjust the outputs to practically any impedance level including multiple different impedances, suitable for bi-wiring. If you buy these units make sure the irreplaceable input and output plugs are included in the sale.
Quad 303 303
The Quad 303 is especially noteworthy as being an absolute bargain at present, selling for only a few hundreds of dollars. Some audiophiles have rated this amplifier in the $1500 value class. We have restored hundreds of 303s and we have now added a complete rebuild option beyond the standard service, where we also replace every single PCB-level component, to assure correct and trouble-free running for decades.
Quad current-dumping amplifiers: 405, 306, 606, 707, 909 405 306 520 606 707 909
We can adjust the sensitivity of 405s, 606s, 707s, and 909s at no extra charge. Many users find these too sensitive: a 2x or 3x gain reduction makes them more usable. The selected Berndt Ludwig 405 modifications we perform are sufficient to more or less transform a 405-1 into a 405-2.
Harman Kardon Harman Kardon Citation 12
The Harman Kardon Citation series is very under-appreciated. We recently serviced a Citation 12 whose performance was quite stunning, far in advance of its specifications. The channel separation, bandwidth, and signal-to-noise ratio are exceptional, and the total harmonic distortion was far below the modest 0.1% specified.
Leak LeakPointOne LeakStereo20 LeakStereo50 LeakStereo60 LeakTL10 LeakTL12 LeakTL12Plus LeakTL25 LeakTL50
We service all Leak valve amplifiers at a fixed price per channel. We specialize in undoing prior modifications by well-meaning amateurs, or in some cases professionals, and restoring them to factory condition.
McIntosh McIntosh MC240
We service all McIntosh valve amplifiers.
Radford Radford MA25
We service all Radford amplifiers, both valve and solid-state.
Mullard
The Mullard 5/10 and 5/20 amplifier circuits formed the basis (in many cases, the entirety) of many British and Australian amplifiers in the 1950s.
Other brands
Service of other-brand valve and solid state amplifiers is subject to availability of service material and a $90 inspection fee.

Tuners

We specialize in RF and IF alignment and MPX calibration of valve and solid-state AM and FM tuners by Quad, Leak, Radford, Sugden, Dynaco, H.H. Scott, Fisher, McIntosh, and other fine manufacturers. We can evaluate the alignment and calibration of your tuner using our B&K, Sound Technology, and Tektronix test equipment without even removing the cover.

Acoustical A.M. Tuner ('half-moon') AM1
This unit is part of the Quad II/22 setup with the same power requirements. It is an audiophile-grade AM tuner with two bands, LW and MW, and two switchable bandwidths, 'tune' and 'wideband' (12KHz). This rare early version is reputed to be the best-sounding of all Quad AM tuners.
Quad AM Tuner (European/Export) AM2
The correct name for this is 'the AM tuner', although it is often known as the AM1. This unit is part of the Quad II/22 setup with the same power requirements. It is an audiophile-grade AM tuner with several bands and switchable bandwidths. European models had LW, MW, and SW bands; export models had MW, SW1, and SW2 bands. Both models had three selectable bandwidths: 'narrow' for tuning; 'filter' which provides a 10KHz notch filter which needs to be retuned to 9KHz since AM frequencies were reallocated to 9KHz spacing in the 1970s; 'wide' providing a 12KHz wideband unfiltered output, which sadly is more than double what any AM station broadcasts these days.
Quad FM FM1
The correct name for this is 'the FM tuner', although it is often known as the FM1. This is part of the Quad II/22 setup, needing to be powered by the 22 control unit or a separate 330VDC supply. When well-aligned, it is a very serious audiophile contender among valve FM tuners. There are four or five circuit variations, depending on serial number, including valve changes. The original factory 'bird-cage' decoder is now of historical interest only, and should generally be replaced with a modern unit. However we can certainly align and renovate this original MPX unit, which will substantially improve the sound.
Quad FM2 FM2
This is essentially an 'FM tuner' in an AM3 case to match the 33 preamp, with an independent mains supply, and with somewhat better stereo performance than the 'FM tuner' due to minor circuit tweaks, and an internal stereo decoder. Not to be confused with the later solid-state FM3 which superceded the FM2: see below. Although the FM3 is a most competent performer, many audiophiles and collectors prefer the FM2, especially with a modern stereo decoder. We can replace the FM2 decoder with a much better-performing modern unit.
Quad AM3 AM3
This is essentially an 'AM tuner' in an FM2-sized case with an independent power supply. Like its predecessor, it is an audiophile-grade AM tuner with LW, MW, and SW bands and switchable bandwidths. This was Quad's last valve tuner and also their last AM tuner. Only 2000 were made and they are now much sought-after, changing hands for four-figure (AUD) prices.
Quad FM3 FM3
This is the solid-state replacement for the FM2 above, fitting into the same case as the 33 preamp and looking almost identical to the FM2 from the front, except that the indicator lights are in the reverse positions. There are three distinct versions: serial nos. 1-5884, 5885-9999, and 10,000 upwards. To our ears the early FM3 before serial number 5885 sounds better than the later one, although it is more of a servicing headache: the MC1305P decoder chip used early in the production run has seven adjustments to the two required by the MC1310P used subsequently.
Quad FM4 FM4
The FM4 tuner matches the 34 and 44 preamps and is a superb piece of work, with 7-preset station memory, and a laid-back sound to die for. We can now supply and fit a new CPU made by Quad for this tuner, which not only allows for 14 pre-set stations but also eliminates the battery. We can also supply and fit a factory modification for early models with long-term frequency drift.
Quad FM66
The FM66 and subsequent FM77 and FM99 Quad tuners are substantially similar to the FM4, but with a revised RF section and remote control.
Dynaco DynacoFM3
The legendary Dynaco FM-3 was one of the best-sounding valve tuners of the era. They were produced in enormous numbers, largely as kits. After all this time an FM-3 will certainly need alignment, and possibly renovation, including coupling capacitor upgrades and PEC filter correction. We have serviced this model and can correct the de-emphasis to 50μS for UK/European/Australia/New Zealand broadcast conditions.
H.H. Scott HHScott330 HHScott335
H.H. Scott made some of the finest FM tuners and MPX units of the valve era, including the 310, 314, 330, and 350 series, and the 335 MPX unit. We have serviced all these models and can correct the de-emphasis to 50μS for Australia/New Zealand broadcast conditions.
Leak Troughline LeakTroughline2 LeakTroughline3
These are among the most sought-after of all British valve tuners, with exceptionally stable tuning due to three separate design elements; two stages of limiting; and quite remarkable sound. The original factory stereo decoder was unfortunately a worthless piece of junk, and we take great pleasure in replacing it with a modern unit.
Leak Stereofetic: Leak Stereofetic
These are not among the most sought-after of all British tuners, for reasons which escape us. They have superb technical specifications, and audio performance quite similar to the Troughline series.
McIntosh
McIntosh made fine valve tuners, notably the MR66 and MR67 series, which we have serviced, including the MR66's outboard MA-6 MPX decoder.
Other brands
We have also serviced tuners by Harmon-Kardon, Luxman, Pioneer, Sansui, Sony ES, etc., and in general can service and align almost any valve-based tuner, subject to availability of service information.

The stereo MPX unit we supply is based on the LM4500 IC used in the Quad FM4 and many other quality tuners.
Quad FM3s often require replacement of panel lamps, not included in the service but available for a small charge.

CD players

We offer the CD player services mentioned below. A grinding noise when moving the tray in and out indicates the need for tray alignment and a new pinion wheel.

Condition report

Sometimes you just want to know whether something is working, and how well, to help you decide whether to service, sell, etc. We offer a condition report service: an evaluation and written report on the current performance of any pre-amplifier, amplifier, active crossover, or tuner, for your information. We perform a visual examination, graduated power-up, and measure as follows:

Preamplifiers
THD, IMD, bandwidth, RIAA accuracy, output level, all inputs and all outputs.
Power amplifiers
THD, IMD, bandwidth, stability, total power (up to 200W only).
Active crossovers
Gain, THD, IMD, crossover point(s), output level.
Tuners
RF sensitivity, quieting, THD, IMD, audio bandwidth, FM de-emphasis accuracy, stereo channel separation.
This service can be done while you wait and costs $A30 per functional unit, i.e. $A60 for integrated amplifiers (preamp+amp) or $A90 for receivers (preamp+tuner+amp).

Site visits

For large installations such as recording studios we can also do a site visit, to check all your channels of all your gear. Of the services listed, only the standard THD, noise, bandwidth, and power tests are portable. Price on application, including travel time in both directions.

Products

Service kits

Do-it-yourself service kits for most of the solid-state Quad units are available at the Dada Electronics Europe Webshop. $ASK us about kits for Quad/Leak/Radford valve units and tuners: see Contacts below.

In addition, we supply further do-it-yourself service kits as follows:

Kits

Each kit consists of a set of PSU capacitors, other electrolytic capacitors, and other capacitors, resistors and diodes as required. Complete instructions are provided, and support via email is available during business hours to a reasonable extent. You will need forceps or pliers, screwdrivers etc., a temperature-controlled soldering iron, leaded solder, desoldering wick or a desoldering pump, a multimeter, and reasonable proficiency in soldering and desoldering. Prior experience in electronics is preferable if not essential.

Spare parts

A large range of spare parts is available at the Dada Electronics Europe Webshop. In addition, the following spare parts are available for immediate purchase here from local stock.

Parts
General parts
Power transistor sets

Our power amplifier kits and capacitor sets use Kemet BHC PSU capacitors with 28,000 hour rated lifetimes.

Component complements by unit
Unit Capacitors Power transistors 4066
50E (pair) 2 x 4700μF 4 x MJ15003
303 3 x 4700μF 4 x MJ15003, 1 x MJ802
405 2 x 10,000μF 4 x MJ15003
306 2 x 6800μF 4 x MJ15003
520/606/707/909 4 x 15,000μF 12 x MJ15003 or 2N3773
34 5
44 4
66pre 4

Quad plastic parts

The following Quad plastic parts are now available for order, 3D-printed on demand, at our Shapeways store.

Due to the limitations of the 3D printing process, these parts are very similar to, but not identical with, the originals, and colour matching is not exact. Redundant numbers have been removed from some knobs. Separation, removal of knockouts, and minor trimming may be required. 6mm M3 hex head grubscrews are required for most shaft-mounting controls. A 1.5mm Allen key is required to fit all parts having grubscrews. A 1/4" 2BA screw is required for the Quad II foot mount, available from us or several suppliers of British fasteners.
Quad plastic parts
Quad 2 series
Quad 33 & 303
Quad FM2/FM3/AM3
Quad 4 series

Due to the limitations of the 3D printing process, these parts are very similar to, but not identical with, the originals, and colour matching is not exact. Redundant numbers have been removed from some knobs. Separation, removal of knockouts, and minor trimming may be required. A 1.5mm Allen key is required to fit all parts having grubscrews. Greyed-out options are not yet available. These parts are printed on demand: please allow at least two weeks for despatch.

Dada Engineering Quad 303 & 405 replacement boards

Replacement PCB boards for Quad 303 and 405 by Dada Engineering are available direct from us or at the Dada Electronics Europe Webshop. These are manufactured to the highest standards and follow the latest issued Quad designs. The 303 boards provide options for sensitivity adjustment and for fully complementary output transistor stages.

Unit PCB complement
303 2 x amplifier boards, 1 x PSU board
405 2 x amplifier boards

Prices shown are per single board. These prices fluctuate with the AUD/EU exchange rate.

We provide a fitting service for Dada Engineering PCBs at $A30 per board including full testing, or a full inspection, test, and alignment service at $A60 after you've fitted your boards but before first power-up.

For Sale

For Sale

We don't do much trading in complete units, but things occasionally come our way for sale. All prices in AUD. Please contact us for further details.

iPad/iPhone/iPod repairs

We can replace screens and batteries in any model iPad, iPhone, or iPod. Same day service. We do not require your unlock code. Test when you collect. Booking and 50% deposit required. Too many models to list here, please ask.

Guitar amplifiers

We can undertake repair and renovation of any valve-based Fender, Gibson, Gretsch, or Eminar guitar amplifier at T&M. We may be able to service other brands, subject to availability of service information. We do not service solid-state guitar amplifiers.

We can also supply and fit the TBX-1 and Active Mid-boost controls for Fender Stratocasters, and perform electrical repairs inside electric guitars.

Coming soon We hope to offer a custom pickup winding service in the near future. Please contact us if interested.

Test equipment

Tektronix repair

After various entertaining incidents in our laboratory, we can now undertake repair of Tektronix TM500 mainframes and a number of plugin units. Repairs are charged at T&M. Please ask us about other Tektronix equipment not listed here, but note that we do not service oscilloscopes of any kind, although we can service certain 7000-series plugin units as shown below.

AA501 SC504 SG505 TM504 7CT1N

Sound Technology alignment and upgrade

We can also perform alignments and Brian Beezley's modifications for Sound Technology ST-1000A units.

Our workbench

Our highly equipped workbench consists of Tektronix™, Sound Technology™, EMC™, and B&K™ test equipment for function and signal generation; THD and IMD distortion analysis and measurement; noise-floor and bandwidth measurement; spectrum analysis; AM and FM tuner alignment; valve testing; transistor curve tracing; and power supply simulation and testing. We can handle both 240VAC and 110VAC equipment.

Procedure

You can purchase kits, parts, and Dada Engineering PCBs online here via our PayPal™ shopping cart. For servicing:

  1. Decide what you want.
  2. Ring or contact us as below to discuss if necessary.
  3. Send your item(s) to us, well packed, with a covering letter detailing any known faults, and providing a return address, phone number, and email address for PayPal billing.
  4. We will confirm arrival and progress of the work, and raise any issues with you as necessary.
  5. We will complete the service and then bill you via PayPal.
  6. When you pay we will re-pack your item(s), reusing your own packing, and send them back to you.
  7. We will enter the Australia Post tracking number on your payment at PayPal: they will send you an email confirming shipping and providing this number.
  8. Happy listening!

Contact

For any of the services mentioned on this page please CONTACT US:

See also

Terms and Conditions