My first possible major problem. Einstein help! Peter

[Rob Tahan]

Ive had my first Diezel for 3 years and thus far have loved them like the first day.
However i think i may have encountered my first problem that i dont believe to be a tube issue. (idk)

So the other night i was playing and i started really hearing this high pitched screeming noise intermittantly out of my Einstein. I switched to channel 1 and it was a constant low hum. Channel 2 is Very high pitched constant feedback sound and Channel 1 is low hum.
What could this be?
I put in a new set of Mesa power amp tubes and 1 preamp tube. After putting them in, the SAME noise. Took the tubes out and they were testing bad.
So im thinking if its a blown output transformer then that could cause the tubes to keep blowing.. Right..?

Any input is greatly appreciated.
Thanks
Rob-

 

[MARK2C]

Open her up and see if any of the 22uf/500V and 220uf/350V filter caps are leaking any yellow goo.

 

[nbarts]

roll the bias pots all the way down & try new tubes

 

[Rob Tahan]

i"ll ask him (the guy thats working on the amp)

He's gonna look at it on Monday so i'll forward him this information.
If anyone has any other ideas or suggestions they would be greatly appreciated.

 

[Peter Diezel]

Thanks Mark2C !

Rob, please send me an email.

 

[darkhorse]

It always amazes me how awesome your customer service is. The fact that Diezel is always there emidiatly when an isuue arises. What can i say, it feels great knowing that the man that made it all happen is there to set everything right. I have great confidence in owning a Diezel amplifier and damn proud of it .

 

[Rob Tahan]

Bingo!
That was it Mark2C!!
How on earth did you know that??
Best service ever...
..hands down. This is why you pay for quality. If i was on tour and tried to contact marshall or whoever id be screwed! Id never think to look at the "caps for yellow stuff leaking"...

 

[MARK2C]

Bingo!
That was it Mark2C!!
How on earth did you know that??
Best service ever...
..hands down. This is why you pay for quality. If i was on tour and tried to contact marshall or whoever id be screwed! Id never think to look at the "caps for yellow stuff leaking"...

Been there. No biggie to pass on the fix when I have heard and seen the same symptoms in person before.

Glad your back up and Papa can get some needed rest !!!!

 

[ttosh]

Bingo!
That was it Mark2C!!
How on earth did you know that??
Best service ever...
..hands down. This is why you pay for quality. If i was on tour and tried to contact marshall or whoever id be screwed! Id never think to look at the "caps for yellow stuff leaking"...

Been there. No biggie to pass on the fix when I have heard and seen the same symptoms in person before.

Glad your back up and Papa can get some needed rest !!!!

I have to ask why the caps were leaking yellow stuff. This sounds like it is from a science fiction movie. Are Diezel amps from Germany or Mars?

 

[rocker]

Bingo!
That was it Mark2C!!
How on earth did you know that??
Best service ever...
..hands down. This is why you pay for quality. If i was on tour and tried to contact marshall or whoever id be screwed! Id never think to look at the "caps for yellow stuff leaking"...

Been there. No biggie to pass on the fix when I have heard and seen the same symptoms in person before.

Glad your back up and Papa can get some needed rest !!!!

You should be one of the moderators in the Diezel sections.

 

[MARK2C]

Inside the caps there are two conductive plates separated by an insulator. The insulator helps keep the two plates from shorting
and is called a dielectric. When the dielectric fails the plates can short together and heat up. The result is the dielectric, or as we
know it as yellow goo is vented so the cap does not explode from pressure. If you look at the photo of the leaking cap you will see a
vent hole at 11:00, but like many things in nature the oozing dielectric takes the path of least resistance and leaks out of the lead.

Reasons for failure:

1. Over Voltage or high wall voltage
2. Heat, eventually the dielectric will dry out
3. Time, these things can dry out if not used

If the cap was manufactured poorly 99.9% of the time it would not have made it past Diezel's 3 days of burn in.
With the Einstein's B+ rail at 400-415V, these caps are only working at 80% + or- capacity so it is not the amps
fault. With caps today some will last 3 years and some will last 40.

 

[ttosh]

Inside the caps there are two conductive plates separated by an insulator. The insulator helps keep the two plates from shorting
and is called a dielectric. When the dielectric fails the plates can short together and heat up. The result is the dielectric, or as we
know it as yellow goo is vented so the cap does not explode from pressure. If you look at the photo of the leaking cap you will see a
vent hole at 11:00, but like many things in nature the oozing dielectric takes the path of least resistance and leaks out of the lead.

Reasons for failure:

1. Over Voltage or high wall voltage
2. Heat, eventually the dielectric will dry out
3. Time, these things can dry out if not used

If the cap was manufactured poorly 99.9% of the time it would not have made it past Diezel's 3 days of burn in.
With the Einstein's B+ rail at 400-415V, these caps are only working at 80% + or- capacity so it is not the amps
fault. With caps today some will last 3 years and some will last 40.

Very cool information, thanks for sharing. I was never questioning anything Diezel to be poorly made as I know that is not the case. Peter's amps are some of the best on the market IMHO in workmanship and sound quality!!

 

[van hellion]

mark2c is my hero! dang your smart bro!

A Wood

 

[tylerisdumb]

Sorry to hijack the thread, but are the symptoms of leaking dielectric always as the OP described? I have been noticing a deterioration in my amp's tone and it becoming noisy.

Is it time for me to replace my caps?
Sorry that the pictures aren't so good!