DSL100H Output problem

[Texden]

I have a DSL 100H head,I took it off standby and have no output,if I dime the volume control, I get a faint output (barely audible)from the 4/12 cab, I took the chassis out and found no fuses blown,and all preamp and power amp tubes glow! I ordered a new set of tubes for it,but power tubes are on back order,I tried the guitar in the effects return and get nothing.I did find R68 and R67 burnt (they were touching each other)
,but those go to the bias testing post,from what I can tell.What else should I check?

 

[Chris-in-LA]

I have a DSL 100H head,I took it off standby and have no output,if I dime the volume control, I get a faint output (barely audible)from the 4/12 cab, I took the chassis out and found no fuses blown,and all preamp and power amp tubes glow! I ordered a new set of tubes for it,but power tubes are on back order,I tried the guitar in the effects return and get nothing.I did find R68 and R67 burnt (they were touching each other)
,but those go to the bias testing post,from what I can tell.What else should I check?

If R67 and R68 are the 1ohm resistors in the bias circuit and they burned, your power tubes may have lost their ground. Normally, an el34 has pins 1 and 8 grounded, either with a wire or the 1ohm resistor.

 

[South Park]

You are getting noice so that means the out put section is working and not blowing fuses no shorts. Check all the plates for power

 

[Pete Farrington]

Check fuses with a meter.
This is a frequent stumbling block for non techs.
They can look ok but actually be open circuit.

 

[Texden]

Check fuses with a meter.
This is a frequent stumbling block for non techs.
They can look ok but actually be open circuit.

I’m getting continuity (voltage)through them

 

[Pete Farrington]

I’m getting continuity (voltage)through them

So is that continuity, ie a resistance measurement, or are you measuring voltage on both terminals of each fuse?
The requirement is to take the fuse out of the fuseholder and check its resistance.
Checking for voltage or otherwise measuring it in circuit may not give the results you might expect.

 

[Texden]

So is that continuity, ie a resistance measurement, or are you measuring voltage on both terminals of each fuse?
The requirement is to take the fuse out of the fuseholder and check its resistance.
Checking for voltage or otherwise measuring it in circuit may not give the results you might expect.

I’ll pull them and check resistance through them tonight,I checked voltage on each side of the fuses