peavey 130 special

[g1]

How about input jack ground to chassis and input jack ground to ground side of zener diodes?

[bcclew]

i cked the outside of the speaker jacks it was 0.06 ohms. ill ck imput jacks tonight and bring amp in tomorow thank

[g1]

Also check R96 .1R10W and it's solder connections.
And check the mounting bolts of the thermal breaker between Q8 and Q11.

[bcclew]

Also check R96 .1R10W and it's solder connections.
And check the mounting bolts of the thermal breaker between Q8 and Q11.

bolts are tight imput jacks 0.3 chassis conections on r96 look fine from chassis to eiyher side is 47.2 ohms the ground between cr36&cr37 shouldnt that give us 0 volts? i will be available to ck anything from now till 9 pm thanks using the amp with that 1.495 volts what will that cause thanks again

[bcclew]

bolts are tight imput jacks 0.3 chassis conections on r96 look fine from chassis to eiyher side is 47.2 ohms the ground between cr36&cr37 shouldnt that give us 0 volts? i will be available to ck anything from now till 9 pm thanks using the amp with that 1.495 volts what will that cause thanks again

[g1]

You said the sleeve of the output jacks measured short to chassis. The connector should be going to one end of R96, so I don't see how you could have 47 ohm reading unless there is a burnt trace.

[bcclew]

maybe i did it wrong i am going to ck again be right back

[bcclew]

maybe i did it wrong i am going to ck again be right back

cking now from chassis to either side of R96 IS 47 OHMS

[bcclew]

I have to leave building be back 930am t0morrow sorry tomorrow ill be here 930 to 400pm thanks

[Enzo]

R54, dead center of the schematic, upper left edge of layout. There is your 47 ohms. What I can;t spot is where the chassis ground is connected to the R96 side.

[g1]

What I can;t spot is where the chassis ground is connected to the R96 side.

In post #51 see pic of layout. R96 connects to spkr jack connector negative. I believe the speaker jacks bolt directly to chassis with no insulation.

[bcclew]

re 130

In post #51 see pic of layout. R96 connects to spkr jack connector negative. I believe the speaker jacks bolt directly to chassis with no insulation.

speaker jacks have fiber washers on both sides off jack.took spkr plug off board neg pin to chassis 47 ohms.i cked jacks with plug off no leak to ground .washers seem fine

[Enzo]

The speaker jacks should not be chassis grounded. R96 puts them 0.1 ohm above ground for current feedback. Grounding the jacks would defeat that.

Good view of insulators:

[bcclew]

jacks are not grounded i said before they have fiber washers i am leaving work now and amp is at work ill be back mon 130pm thanks for all the imput.

[g1]

Enzo, can you look on the layout at the thermal breaker between the output transistors? One of the mounting bolts goes to a trace that runs to a jumper wire then on to the common ground. Is that bolt supposed to ground that trace to the heatsink? Could it be a rivet there instead? His grounding fault seems to be intermittent, as the common voltage there has fluctuated between 1.495V and .114V.
I'm not as familiar with Peavey as some here are, and I'm otherwise out of ideas.