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5e3 troubleshooting assistance needed
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vulture



Joined: 01 Mar 2008
Posts: 4502
Location: Chicago

PostPosted: Sat Jul 15, 2017 8:51 pm    Post subject: Reply with quote

Shocked Found it.

Determined to find out the problem after all this, went back in with chopstick method and prodded around again. I discovered that the wire off pin1 of the 12ax7 had weakened, not the solder, the wire. I guess the 6th time is a charm. Rolling Eyes

Thanks for helping me out. I guess the good thing was that I tweaked everything and ran some needed tests. Still have to address those areas where the voltages are off.
Cheers
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vulture



Joined: 01 Mar 2008
Posts: 4502
Location: Chicago

PostPosted: Sat Jul 15, 2017 9:10 pm    Post subject: Reply with quote

statorvane wrote:

The dropping resistor there should measure around 22K Ohms.


So its an 8.2k in there now. The cathode resistor is at 330ohms. I replaced it with a 250ohm and it helped drop the voltages off the secondary's on the 6V6's to 364V as opposed to the 380V. I have to get a 22k dropping resistor in there.
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statorvane



Joined: 21 Aug 2003
Posts: 1938
Location: Upstate New York

PostPosted: Sun Jul 16, 2017 3:38 am    Post subject: Reply with quote

Glad you got this sorted out.

It seems whoever had this amplifier prior was interested in much higher preamp voltages. Not sure why.
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Johnson82



Joined: 27 Aug 2007
Posts: 1729
Location: New Castle, IN

PostPosted: Mon Jul 17, 2017 8:54 am    Post subject: Reply with quote

Excellent! Nothing like having a problem sorted out!
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