precision fidelity C-9 tube preamp schematics HELP

armed · 18th April 2018, 10:39 PM

I am hoping you guys could help me out...PLEASE..
I'm having issues with my preamp and to make it worst its modded...
one channel is out...now my local tech needs an schematics for it... there are C7 and C4 schematics online, and they are probably different...maybe C7.. any help?

armed · 19th April 2018, 12:46 PM

This is not good ugh

audiowize · 19th April 2018, 06:02 PM

While a schematic would help, having one channel that works and one that doesn't provides a ton of information on how to proceed on the repair.

The first step for the tech would be to take voltage readings on each tube pin on the working channel, then repeat the process for the non working channel.

There will likely be a difference in voltages between working and non-working (and if there isn't, that's also super informative). The specific differences will tell you how to proceed with the repair.

If both channels are out, that's more annoying, but most often a power supply issue. Luckily you don't have that going on.

armed · 20th April 2018, 05:30 AM

Thanks! Yeah he did say he will just trace it.. being mdded he said doesn’t help at all

19th April 2018, 12:46 PM	#2
armed diyAudio Member Join Date: Aug 2015 Location: SoCal	This is not good ugh __________________ Semper Fidelis!

20th April 2018, 05:30 AM	#4
armed diyAudio Member Join Date: Aug 2015 Location: SoCal	Thanks! Yeah he did say he will just trace it.. being mdded he said doesn’t help at all __________________ Semper Fidelis!

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19th April 2018, 06:02 PM	#3
audiowize diyAudio Member Join Date: Aug 2005 Location: Seattle	While a schematic would help, having one channel that works and one that doesn't provides a ton of information on how to proceed on the repair. The first step for the tech would be to take voltage readings on each tube pin on the working channel, then repeat the process for the non working channel. There will likely be a difference in voltages between working and non-working (and if there isn't, that's also super informative). The specific differences will tell you how to proceed with the repair. If both channels are out, that's more annoying, but most often a power supply issue. Luckily you don't have that going on.