I have an Ashdown ABM 200H with a burnt resistor on the power amp PCB.
Any know what value R10 is ?
You need a password to access schems on the company website.
BTW, all the mosfets have blown.
... Phil
Ashdown Bass amp
Jun 08, 2011
9 Replies
** Hi,
I have managed to get the occasional schematic out of them without a password, by emailing technical direct. If you can convince them that you are a bona fide engineer, rather than just an owner, they might help you out as a one-off.
Arfa
out
same here. I think 3 different amps now - if you include issues found in passing , not necessarily related to the symptoms /faults, that may help not hinder.
Don't know if this will help but on the ABM 300/500 output schematic R10 is 220R in the emitters of TR8 and TR9 (BF422) to V-.
Les.
"Les Matthew"
** Sounds very like a probable value.The burnt black remains measured 520 ohms.
... Phil
Same as a Trace AH500 I am repairing right now. 220R to both emitters of BF422, (this one also burnt, reads 880R), collector to 15k to diode to 220R to +V.
One of my Mosfets is blown.
Ashdown are Trace revisited I believe.
Gareth.
220R
Isn't there a connection between Trace Elliot and Orange ?
Dunno. Clive Button was the chief designer at Trace, I think. You often see his name on the PCB's. You also find the initials B.L.T. on his stuff.
Phil, is there anything like that on the Ashdown PCB?
Gareth.
"Gareth Magennis"
** BLT = bacon, lettuce and tomato ??** The amp has gone back to its owner.
.... Phil
I for some strange reason have the impression that Clive was a thin guy, and always hungry, so that makes sense.
Gareth.
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