Amplifier service

[RVA]

Microphonics type of feedback is mostly related to a goofy preamp tube. Did the amp get worse after the new power tubes were installed?

Unusual smells coming from the amp after it's up to temperature?

Swapped all the tubes?

What brand(s) of tubes?

Double checked that 5751? Replace with known good 12AX7?

LED light: Not a clue! House voltages OK?

Thanks.

So does anyone here service their amp periodically, or do you all wait for an issue to arise?

 

[Thatbastarddon]

If by servicing you mean check bias, change tubes, and visually inspect for signs of component failure(maybe do a full voltage check)...then yes.

 

[flatrockmobile]

There is a JVM forum online. Someone there might have had a similar problem.

 

[syscokid]

Or maybe get yourself a nice SS amp.

BLASPHEMY!!!!!

If Mr. Paul Reed Smith heard you say that, he would respond: "That is out of bounds!" Right, Ray?

 

[eSGEe]

Or maybe get yourself a nice SS amp.

LIKE A PEAVEY!!!!!!!!!!!!!!

 

[eSGEe]

BLASPHEMY!!!!!

If Mr. Paul Reed Smith heard you say that, he would respond: "That is out of bounds!" Right, Ray?

With all do respect MR Reed Smith can "bite me" --- I think is the proper response -- eh Ray???

 

[gball]

Or maybe get yourself a nice SS amp.

Boo.

 

[syscokid]

With all do respect MR Reed Smith can "bite me" --- I think is the proper response -- eh Ray???

 

[chilipeppermaniac]

Ray. My friend's Dsl 100 with purple lamp was known to have a design flaw Marshall knew about. Go to Marshall Amp forum

 

[chilipeppermaniac]

DonP n I went around the barn so to speak on that amp. My blind friend left the amp on and a cover over it for like 3 days. Turns out he friend the power tubes. I put 2 new ones in after testing it with 2 off one of my amps.

 

[chilipeppermaniac]

Ray. I will add u to my amp PM that Don, Smitty, ivan, 67 n I discussed all my amp fixes.

 

[RVA]

If by servicing you mean check bias, change tubes, and visually inspect for signs of component failure(maybe do a full voltage check)...then yes.

I can only do the first 2.

 

[RVA]

There is a JVM forum online. Someone there might have had a similar problem.

I am a member. I really do not have an issue. The JVM forum has much about "taming the beast" for high gain feedback, but my issue is on the clean channels with pedals.

 

[RVA]

BLASPHEMY!!!!!

If Mr. Paul Reed Smith heard you say that, he would respond: "That is out of bounds!" Right, Ray?

He would respond, "Out of bounds, Mr. Tuners!"

 

[Thatbastarddon]

I can only do the first 2.

@67plexi usually posts this voltage chart.

Used to determine points of “drift” from spec.

 

[RVA]

@67plexi usually posts this voltage chart.
View attachment 23074
Used to determine points of “drift” from spec.

That means nothing to me!

 

[Thatbastarddon]

I hear you sir.

 

[Thatbastarddon]

It’s used to log the voltage measurements on the amp, and to compare to what they are supposed to be.
I have one for my home brew 18 watt.

 

[Catmandue]

Good luck with the tech. I've bias my DSL15C and my Super Reverb. You might just need new power tubes. If you feel more comfy having a tech check your amp is probably a good idea. I have never been shocked with any of my amps or gear. I'm very careful. These guys who wrote on here they were shocked were very lucky. There is some high voltage DC going on in these.

 

[eSGEe]

That means nothing to me!

HAMMER--- you NEED a HAMMER