Musical Fidelity e300 power amp trannys help :(

[raymondo]

hi folks,

well ive got the above amp which i have repaired a few times. however i'ts now popped one of the o/p trannys, they are craftily labelled f15n/f15p. obviously these are mf's own codes, a habit they are fond of so they can rip you off when you need replacements.
there's a total of 4 per channel.
i've no idea if they are mosfet or bipolar. circuit consists of (input to output ) - 5534 and 5532 , then x2 of each mps a92/a42 (which ive changed a few times), followed by 2sd649/669 pair then the big TO3 f15n/f15p pairs. there is a bias pot too.
amp always sounded good but is terribly designed from an engineering point. originally had x4 50V 10000uf smoothing caps, running at , u guessed it, over 50v (53ish). changed them for 63v while ago.
i actually wrote to MF 1st time those caps dried out, pointing out the problem. Engineering director wrote back claiming the caps were rated at +10% so 55v . pah! the cheek of it.
also the mpsa92/42's literally cook, along with two 1/4 1k0 metal film resistors which should def have been 1/2 watt.
anyway, im flat broke at the minute and need to revive this beast.

if anyone can help with any info i'd be extremely grateful.

many thanks

raymond

[Zen Mod]

post a picture of amp inside , so we can compare it with some schematics we have ......

("we" - any of us )

[raymondo]

god damn photo too big, will resize at work tommorow and pst then.! thanks

[raymondo]

ok not so clear due to the 100k restriction .....here u go

[raymondo]

another

[Zen Mod]

send few full res pics to >choky@neobee.net<

try at least to measure one output transistor - on good channel - is it bjt , with simple diode test on DVM

[raymondo]

hi , i will send you some full res images when i get home later, thanks for the interest greatly appreciated.
will measure one tonight , one channel definately ok .

[raymondo]

ok i sent you some pics :-)

[poynton]

Remarked Exicon Lateral Mosfets


Andy

[raymondo]

any numbers andy? thanks a lot