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Messages - ChewyNasalPrize

#1
Thanks J M! This will be handy for future reference!

I actually sold it a few days ago in "as-is" condition to someone who wanted the speakers mainly (Celestion Vintage 30's). Didn't make sense to me to keep fooling with it given what he offered.

I should have posted this at the time but I forgot.

Thanks to everyone for your help on this one.  :)

Chews.
#2
 :lmao: That's funny!

So how exactly do I inject 100mV 1KHz at the "guitar input" ??

I have an iPod I usually run into amp for testing for sound. Will that work?

I also have a pretty good digital multimeter.
#3
I hooked up the fx out from the twin to the fx in of another amp and still there is signal but very weak. I poked around on the board and put pressure on the fx out jack but nothing. No popping, crackling or volume fluctuations.

Can I test C33 and TR12 without removing them?
#4
Ok, I measured the resistance and both sides are registering right at 211 ohms.

I measured DC voltage again with the amp on and it reads 30 volts on one end and about 33 on the other.
#5
Should the amp be plugged in and turned on? I didn't have it plugged in when I tested the voltages.
#6
Not sure I'm doing it right but R20 reads 0.3 mV on both sides.

It does look a bit discolored to but maybe that's normal.

Edited to say: the "discoloration" was just a shadow.
#7
Yes- all controls appear to be functioning properly- just everything is very low volume.
#8
Update:

I pulled the chassis and a visual inspection doesn't turn up anything suspicious- nothing burnt, broke, loose, etc. Only one fuse in the back of the amp and it is fine.
#9
Hey guys- I got this TE Twin- all solid state that has a volume issue.

Sound comes out but it is very weak- not distorted or crackly or anything... just very "far away" and quiet sounding.

I also have a TE 1x12 combo that works great. I ran a patch from the effects loop send of the good amp to the return of the bad amp and the volume becomes normal (LOUD) on the bad amp but it is a dry signal that responds to the good amp's eq (but no reverb comes through- either the good or bad amp's). I can control the volume of both amps independently of each other.

I tried reversing the patch- send from the bad amp to the return of the good amp. While sound comes through- it is weak just like in the bad amp.

Any ideas on where to start looking for the problem?

Thanks.

Chews.
#10
Tubes and Hybrids / Re: Peavey Classic VT Blowing Fuses
October 24, 2014, 04:44:12 PM
Replaced the diode and checked for frayed wires and such- couldn't find anything obvious that might cause the diode to fail.

Fired it up and it seems to be working fine again. Played it for about an hour and sounds right to me. Of course I'll keep my eye (or ear) on it. If it fails again anytime soon I'll know to look elsewhere for the cause.

Thanks everyone for the help on this! I really appreciate it. :dbtu:

Chews.
#11
Tubes and Hybrids / Re: Peavey Classic VT Blowing Fuses
October 23, 2014, 05:43:52 PM
I just got the diodes. I want to be sure I only need one per tube socket. They are really small compared to the originals.

Also, which end goes to ground? There's a silver stripe going around one end of the diode.

Thanks!
#12
Tubes and Hybrids / Re: Peavey Classic VT Blowing Fuses
October 20, 2014, 04:03:39 PM
Just ordered two of these from Tube Depot: R3000 .25A / 3000V High Voltage Protection Diode

Checked with Peavey and they did have the original diodes but they had a minimum order $$ plus shipping would have made them too much to justify when I was able to get the R3000's for less than $3 shipped.

Should be here in a few days.  :dbtu:
#13
Tubes and Hybrids / Re: Peavey Classic VT Blowing Fuses
October 17, 2014, 02:46:54 PM
ARITE- I think I found the problem.

I plugged the amp into a regular outlet and sure enough it fired up like normal. I gave the tubes a bit of a wiggle just to make sure they were seated good and then "POP" goes the fuse.

I put another fuse in and plugged it back into the limiter and when I wiggled the tube closest to the power transformer, it would crackle. On closer inspection and probing with a wooden skewer, a little black diode bridging two of the pins was sparking when I poked it and shorting out. I unplugged everything and took a close look at it and there is a crack running almost the length of this little guy.

Guess I'm off to the electronics store!  :dbtu:

Edit to add: This diode is marked "2873." Are they readily available? Should I use something else/better? I'm thinking I should replace the one in the other socket as well just for good measure?
#14
Tubes and Hybrids / Re: Peavey Classic VT Blowing Fuses
October 17, 2014, 10:25:39 AM
I did not have a load hooked up to it. I plugged it into an 8 ohm cab and switched to a 60 watt bulb. Turned it on and the bulb got very dim and the power indicator lamp on the amp came on and stayed on. Very faint glow in the power tubes too.

I just rechecked the front diodes (this time using the correct diode testing settings) and they all read right at .495 +/- .001 or .002. The rear diodes are all measuring around .52.

#15
Tubes and Hybrids / Re: Peavey Classic VT Blowing Fuses
October 16, 2014, 06:25:26 PM
Found a 40 watt bulb-

I turned on the amp and I guess it was probably half the brightness as it should be.

Turned off and removed tubes and turned back on- still seemed to be about the same brightness.

Turned off and replaced tubes and turned back on- light bulb got WAY dim-- almost barely on and for a brief moment the power indicator lamp on the front of the amp came on -- but then went out. Bulb still very dim.

??