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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment.

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Old 27th Apr 2016, 11:25 am   #1
jukecrazy
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Default HH MA100 mixer amp problems

This is the power amp board for an MA100HH, a few components are well burnt as similar to this thread. Any idea on what I should replace and values, I'm as unable to find a circuit.
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Old 27th Apr 2016, 1:03 pm   #2
Alistair D
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Default Re: HH electronics amp

I have a couple of HH schematics. Both of them use similar driver boards but not the AO3103/2 version.

All may not be lost though. I will PM you.

Al
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Old 27th Apr 2016, 7:04 pm   #3
jukecrazy
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Default Re: HH electronics amp

Thank you Alistair.

I will check out those items first.
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Old 27th Apr 2016, 10:39 pm   #4
jukecrazy
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Default hh ma 100 mixer amp problems

I have had this old HH amp lying around for a few years now as it was gifted from my dad when it gave up the ghost and he got a new one.

I fired her up to see what hapened and we got a very nice garbled sound from all outputs, loud but very distorted.

Shut her down and opened her up and a good look around the power boards and we can see what is playing up as shown in pics.

The power circuit has a few burnt components, the board is model number A03103/2 and I cannot find a circuit of this version of the board.

I have found different version but the components seem to differ. Need some help in identifying these burnt pieces, which ones to replace and where to get them from.

Majestic who do HH can supply a complete board for 40 quid so if I mess up its an option.

All help appreciated thanks to all for looking in.
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Last edited by Station X; 27th Apr 2016 at 11:10 pm. Reason: Threads merged.
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Old 27th Apr 2016, 10:40 pm   #5
jukecrazy
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Default Re: hh ma 100 mixer amp problems

I forgot to mention the transistor next to the burnt resistor is number 2N5415 I believe.

Need to clarify the value of R19 and R20 plus what other bits should I change whilst it's out?
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