Loud clicking noise

[dcribbs1412]

Bill,Tony
Really appreciate you guys giving me your time
With that said...Voltages are
V1...192...197...1.7...1.8
V2...202...191...1.5...1.7
V3...304...305

I tried to use another amp for testing the pre and power
both ways I got the cutting out farting stuff...not sure I'm doing it right
I have a cable from preamp out of bad amp to power in of good amp
both amps are on and both have a different speaker plugged in.Both speakers have sound.
Guitar is plugged into bad amp and volume is with good amp....farting/cuts out...same when I do it reversed...

Darin

[alvarezh]

Darin, if that's the case, looks like you have power supply problems. P.T., filters, etc. Seems ok at idle as your voltages are reasonable, but once you get a signal (load) through any section of the unit (preamp/poweramp), the problem begins.

Hopefully Tony and or Bill can come with some suggestions.

Best wishes.

[bcook]

Make sure each grid has a path to ground. If you have one reading near infinity that's where your problem is.

[gary sanders]

http://www.youtube.com/watch?v=Tx1XIm6q4r4

Sorry......back to the actual topic

[dcribbs1412]

Darin, if that's the case, looks like you have power supply problems. P.T., filters, etc. Seems ok at idle as your voltages are reasonable, but once you get a signal (load) through any section of the unit (preamp/poweramp), the problem begins.

Hopefully Tony and or Bill can come with some suggestions.

Best wishes.

That makes sense alvarezh...

Make sure each grid has a path to ground. If you have one reading near infinity that's where your problem is.

That would be the 6.2K's I have on pin 5 of both power tubes?

[dcribbs1412]

http://www.youtube.com/watch?v=Tx1XIm6q4r4

Sorry......back to the actual topic

Funny

[talbany]

Bill,Tony
Really appreciate you guys giving me your time
With that said...Voltages are
V1...192...197...1.7...1.8
V2...202...191...1.5...1.7
V3...304...305

I tried to use another amp for testing the pre and power
both ways I got the cutting out farting stuff...not sure I'm doing it right
I have a cable from preamp out of bad amp to power in of good amp
both amps are on and both have a different speaker plugged in.Both speakers have sound.
Guitar is plugged into bad amp and volume is with good amp....farting/cuts out...same when I do it reversed...

Darin

Darin
(Amp testing 101)

If your using the pre out of the bad amp into the (power amp in) of a good amp you should only get sound out of the amp you are slaving in to (the good amp) .. Since you are breaking the signal chain between the pre and power sections of the bad amp.. If you are getting sound out of both amps then something is wrong!!..
If the farting cutting out is going on using the pre out (of the bad amp) into the power amp in of a good amps output section chances are it's in the preamp of the bad amp.. While you are doing this I would then check the output section of the bad amp by slaving the pre out of the good amp in to the power amp section of the bad amp.. If the farting cutting out happends after you check both pre and power amp sections of the bad amp.. Take the bad amp and chuck it out the window.. That would be just to weird..

Tony

[alvarezh]

If all else fails……disconnect the HRM mod and reconnect as it was originally. That would eliminate any errors there. Who knows, maybe the circuit board (HRM) is somehow built with an error.

My last penny!

[dcribbs1412]

Bill,Tony
Really appreciate you guys giving me your time
With that said...Voltages are
V1...192...197...1.7...1.8
V2...202...191...1.5...1.7
V3...304...305

I tried to use another amp for testing the pre and power
both ways I got the cutting out farting stuff...not sure I'm doing it right
I have a cable from preamp out of bad amp to power in of good amp
both amps are on and both have a different speaker plugged in.Both speakers have sound.
Guitar is plugged into bad amp and volume is with good amp....farting/cuts out...same when I do it reversed...

Darin

Darin
(Amp testing 101)

If your using the pre out of the bad amp into the (power amp in) of a good amp you should only get sound out of the amp you are slaving in to (the good amp) .. Since you are breaking the signal chain between the pre and power sections of the bad amp.. If you are getting sound out of both amps then something is wrong!!..
If the farting cutting out is going on using the pre out (of the bad amp) into the power amp in of a good amps output section chances are it's in the preamp of the bad amp.. While you are doing this I would then check the output section of the bad amp by slaving the pre out of the good amp in to the power amp section of the bad amp.. If the farting cutting out happends after you check both pre and power amp sections of the bad amp.. Take the bad amp and chuck it out the window.. That would be just to weird..

Tony

Tony,
maybe I have the FX loop wired wrong...but I don't think so...I'll check again...I do get sound out of both amps when using the bad amp pre to the good amp power in... I might draw a picture to make sure I'm doing it right...
Sorry I am confused...and I think I need some beer.(it's beer thirty)
I will continue this weekend..and if I don't get it by Monday...
bada bing bada boom...out the window.

Darin

[SoundPerf]

if it is, would the loop of the "good" amp being parallel have anything to do with the odd behaviour?(not the ticking/farting) That's the only question that comes to mind very quickly.

I guess more likely the "problem amp's" loop being wired wrong makes more sense.

[67plexi]

Darin, I don't see a ground wire on the 10k CTS bias pot.

[ayan]

Darin, I don't see a ground wire on the 10k CTS bias pot.

The "tail" resistor is soldered to the back of the bias pot, and from there a black wire connects to the gound lug on the power tube socket. Is that what you meant?

Cheers,

Gil

[67plexi]

Gil, Yes the tail resistor, I solder the tail resistor to a ground lug not the 10k pot case.
With a marginal ground the bias current will arc inside the 10k pot and cause the symptom that
Darin is having.

Steve.

[wjdunham]

Bill,Tony
Really appreciate you guys giving me your time
With that said...Voltages are
V1...192...197...1.7...1.8
V2...202...191...1.5...1.7
V3...304...305

I tried to use another amp for testing the pre and power
both ways I got the cutting out farting stuff...not sure I'm doing it right
I have a cable from preamp out of bad amp to power in of good amp
both amps are on and both have a different speaker plugged in.Both speakers have sound.
Guitar is plugged into bad amp and volume is with good amp....farting/cuts out...same when I do it reversed...

Darin

Your voltages all look good - you positive it's not your guitar cable

Tony's right, while it's possible there's something that is affecting both the preamp and power amp, I think it's more likely something's wrong in your test configuration that you're hearing the problem both ways, or you FX loop is not quite right. Keep posting your results, someone will come up with the right experiment that will help you find the source of the problem.
Bill

[dcribbs1412]

Gil, Yes the tail resistor, I solder the tail resistor to a ground lug not the 10k pot case.
With a marginal ground the bias current will arc inside the 10k pot and cause the symptom that
Darin is having.

Steve.

Steve,Gil,Chris
Thanks for your time
I added a ground to the bias pot...no change...not sure if its fried or not
but I may change it out.

here's a few pics...would be very appreciated if someone could find the time check my loop wiring...shielded cable goes to COM of OD relay
purple goes to .02 cap orange goes between 2.2uf cap and 390 ohm resistor
I will try the loop test again with another amp...
disregard the NFB loop on V1 it is disconnected.

http://i1018.photobucket.com/albums/af3 ... HRM012.jpg
http://i1018.photobucket.com/albums/af3 ... HRM011.jpg
http://i1018.photobucket.com/albums/af3 ... HRM015.jpg
http://i1018.photobucket.com/albums/af3 ... HRM013.jpg
http://i1018.photobucket.com/albums/af3 ... HRM017.jpg

Your voltages all look good - you positive it's not your guitar cable

Hey Bill
man I wish it was that easy of a problem
in fact after testing(or failing to) yesterday
I played the amp I was using for power(low plate 124 style) for about an hour
with the same cable...it was a long lunch

Keep posting your results, someone will come up with the right experiment that will help you find the source of the problem.

You guys are what gives me confidence
I've learned some much here..I feel a little embarrassed
posting my problems only to have it be a silly error on my part.

Darin