I have a AMT SS11B suddenly no sound comin out
The power supply seem ok .. all led indicator is on
but no sound is comin out
so I remove the circuit board and check all the supply
what I found is there is no high voltage supply in the unit
I check all tube is fine .. I think it is two solid state tube there
seem they use an IC dc converter that convert 12v to 300v
It is mark with VT14
Unfortunedly the serial number has been erased
maybe you can tell me what it is .. or might be anyone had the same problem with me
AMT SS 11B Preamp no sound no high voltage supply [SOLVED]
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apollomusicservice
- Resistor Ronker
Information
At first put a tubes out and than measure high voltage.
apollomusicservice wrote:At first put a tubes out and than measure high voltage.
I already do that .. and still there is no high voltage @pin 1 & 6 of the tube-socket
I search in internet that someone upload guts of SS11a / 1st edition
I saw the mark of those IC is "10R P992n" .. kinda blur pict but i think that mark
is close enough .. the I google it and nothing I can't find about it
Might be it is a custom build IC or something.. since they had custom solid state 12ax7 tubes too
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apollomusicservice
- Resistor Ronker
Information
OK...then it would be useful some DC voltages at: C31, C33, C47, C52 and C49satriani08 wrote:apollomusicservice wrote:At first put a tubes out and than measure high voltage.
I already do that .. and still there is no high voltage @pin 1 & 6 of the tube-socket
I search in internet that someone upload guts of SS11a / 1st edition
I saw the mark of those IC is "10R P992n" .. kinda blur pict but i think that mark
is close enough .. the I google it and nothing I can't find about it
Might be it is a custom build IC or something.. since they had custom solid state 12ax7 tubes too
apollomusicservice wrote:OK...then it would be useful some DC voltages at: C31, C33, C47, C52 and C49satriani08 wrote:apollomusicservice wrote:At first put a tubes out and than measure high voltage.
I already do that .. and still there is no high voltage @pin 1 & 6 of the tube-socket
I search in internet that someone upload guts of SS11a / 1st edition
I saw the mark of those IC is "10R P992n" .. kinda blur pict but i think that mark
is close enough .. the I google it and nothing I can't find about it
Might be it is a custom build IC or something.. since they had custom solid state 12ax7 tubes too
Thank you Apollomusicservice
I really appreciate that
Well the dc voltage at C49: 12v also C43,44 only C48 is 6volt
nothing read at C57,58,59 which is should be some high voltage there
The good news is I already found the mark of both IC
it is a Dual N mosfet IRF7341 ( i think it was 10RP992n )
And a half bridge driver IR21531s
I think those two had problem so I decided to replace them
just order from ebay
I'll let you know when they come and ready for replace the old one
Thank you again Apollomusicservice
-
apollomusicservice
- Resistor Ronker
Information
Something yes, something no.satriani08 wrote:apollomusicservice wrote:OK...then it would be useful some DC voltages at: C31, C33, C47, C52 and C49satriani08 wrote:apollomusicservice wrote:At first put a tubes out and than measure high voltage.
I already do that .. and still there is no high voltage @pin 1 & 6 of the tube-socket
I search in internet that someone upload guts of SS11a / 1st edition
I saw the mark of those IC is "10R P992n" .. kinda blur pict but i think that mark
is close enough .. the I google it and nothing I can't find about it
Might be it is a custom build IC or something.. since they had custom solid state 12ax7 tubes too
Thank you Apollomusicservice
I really appreciate that
Well the dc voltage at C49: 12v also C43,44 only C48 is 6volt
nothing read at C57,58,59 which is should be some high voltage there
The good news is I already found the mark of both IC
it is a Dual N mosfet IRF7341 ( i think it was 10RP992n )
And a half bridge driver IR21531s
I think those two had problem so I decided to replace them
just order from ebay
I'll let you know when they come and ready for replace the old one
Thank you again Apollomusicservice
You're not be able DC reading at C57, 58, 59 because they operate in high speed circuit.
You are right for self-oscillating half-bridge driver IR21531s, but transistors are IRF7103. I had that model.
Good luck.
I've both ic from mouser yesterday
And I swapped those ic with new one
just checking the high voltage at C57 is 324v
and at C59 is 318v
everything back in normal now
put them all together and just tested it sound pretty good
And I swapped those ic with new one
just checking the high voltage at C57 is 324v
and at C59 is 318v
everything back in normal now
put them all together and just tested it sound pretty good
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