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Audiofng 13th February 2003 09:19 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.


SY 13th February 2003 09:30 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 13th February 2003 11:04 PM

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


fdegrove 13th February 2003 11:12 PM


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:


Keep us posted,;)

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