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-   -   Troubleshooting Problem in Tube Preamp (http://www.diyaudio.com/forums/tubes-valves/11125-troubleshooting-problem-tube-preamp.html)

Audiofng 13th February 2003 10:19 PM

Troubleshooting Problem in Tube Preamp
 
Please help try to solve my problem. I just purchased a Dynaco PAS2 Preamp and it worked fine untill one of the tubes seemed to blow, (it was only glowing half as bright as the rest). I replaced it and still have the problem. The problem is I only have half output on the right channel and full output on the left channel. If I use the tape output then I have full output on both channels.

Any suggestions pleassssse.

Clint

SY 13th February 2003 10:30 PM

Measure the DC voltages on the line amp tube from the suspect channel. Post your results and I'll bet we'll all have some good ideas.

Audiofng 14th February 2003 12:04 AM

All dc voltages are correct as per the owner's manual. Starting to suspect the RCA connectors. Going to replace them tomorrow. I will let you know. Thanks

Clint

fdegrove 14th February 2003 12:12 AM

AH....
 
Hi,

You could be right there...tubes rarely ever die just like that.
Also check for a faulty contact on the selector switch.

If you don't have a copy yet,a manaul for the Pass-2 can be downloaded from:

UNCLE NED.

Keep us posted,;)


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