Good morning ladies and gentlemen.
I hereby present you my trouble finding information on the amplifier branded with "ITL MA-100", an amplifier made in the UK. This particular unit has a calibration sticker from '89. Since I am in the job of repairing this poor bastard, I would like to find some more information on whether it is worth me hunting down the original parts (for the hardcore vintage collectors) or if I can take equivalent mosfets.
Can someone help me find some information on this device? It seems like I can at most find sale sites and auctions, and one or two repair threads.
If there hasn't been a lot of info on it, I guess that'll be my task then.
Cheers! Anna
Links to found info:
ITL MA-80 ein Kanal ist weg !, Hifi-Klassiker - HIFI-FORUM -> A thread about a repair on the complimentary preamp | contains inside pictures.
ITL MA 200 power amp - 2 Channel - HiFi WigWam ->
I hereby present you my trouble finding information on the amplifier branded with "ITL MA-100", an amplifier made in the UK. This particular unit has a calibration sticker from '89. Since I am in the job of repairing this poor bastard, I would like to find some more information on whether it is worth me hunting down the original parts (for the hardcore vintage collectors) or if I can take equivalent mosfets.
Can someone help me find some information on this device? It seems like I can at most find sale sites and auctions, and one or two repair threads.
If there hasn't been a lot of info on it, I guess that'll be my task then.
Cheers! Anna
Links to found info:
ITL MA-80 ein Kanal ist weg !, Hifi-Klassiker - HIFI-FORUM -> A thread about a repair on the complimentary preamp | contains inside pictures.
ITL MA 200 power amp - 2 Channel - HiFi WigWam ->
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The internal design of the ITL MA-80 reminds me very much of the look of an Alphason Apollo amp I have in bits - like they were designed by the same person. This Apollo has blown IRF530 & IRF9530 output FETs which I am hoping to replace with FETs from ON Semi.
Good luck! The MA-80 is the pre-amp for the MA-100; they were supposedly sold together.
The output MOSFET's in the MA-100 are 2SK1057 and 2SJ161, N and P channel Emode MOSFETs respectively.
https://www.renesas.com/us/en/document/dst/2sk1056-2sk1057-2sk1058-datasheet
https://www.renesas.com/us/en/document/dst/2sj160-2sj161-2sj162-datasheet
The output MOSFET's in the MA-100 are 2SK1057 and 2SJ161, N and P channel Emode MOSFETs respectively.
https://www.renesas.com/us/en/document/dst/2sk1056-2sk1057-2sk1058-datasheet
https://www.renesas.com/us/en/document/dst/2sj160-2sj161-2sj162-datasheet
Just to clarify - the preamp is the MA8, the integrated amp is the MA-80 (there was also an MA-120). When Bowers & Wilkins wanted an amp, ITL is the company they bought. They repackaged the basic MA-80 design as the Aura VA-80.
Unfortunately, Renesas no longer produce lateral mosfets 2SK1056-1058 nor complementary types 2SJ160-162. There's only Exicon EXC10N20/ EXC10P20 in TO247 package or double-die versions in TO264. They're available from Profusion PLC at Southend and a few global parts distributors too, AFAIK. Fortunately, the single die versions meet the specs of 2SK1058/J162 so they may be considered direct replacements. https://www.profusionplc.com/parts/ecx10n20-s
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