Need JCM 800 2204 service advice

[finnman]

Got my used JCM 800 2204 50W, MK2 head a few weeks back.
I found and amp tech near me.
I would like to have it gone over to check it out.
I got it all original.
What should I have him check for?
Correct bias? What else?
If the tubes need replacing what kind should I go for?
I know one of the preamp tubes have been changed to a EH.
Thanks
Finn
link to repairman http://www.fatubesound.com/

[Twisteramps]

Re: Need JCM 800 2204 service advice

Have him replace the filter caps if they look like the originals. Not sure about the tubes - are they original too?

Pete

[finnman]

Re: Need JCM 800 2204 service advice

2 of the 3 preamp tubes have markings of (2A1 AJ7). The other says:Electro-Harmonix 12AX7EH Made in Russia 01 02
No markings on the Power tubes.
How many filter caps are there?

[nonamemx]

Re: Need JCM 800 2204 service advice

How much does it cost to change filter caps?

(Im going to give my laney a tune up soon)

[Twisteramps]

Re: Need JCM 800 2204 service advice

Depends on how many filter caps you have, how long it takes to replace them, and what your tech charges. [img]/images/graemlins/smile.gif[/img] Oh, and what brand he replaces them with... not so much for JJs, if you want something stupid expensive like some of the audiophile caps that angela.com sells, bend over.

Pete

[finnman]

Re: Need JCM 800 2204 service advice

Anything else?
Bias, Tubes if needed, Filter caps if needed?
Any idea on the tubes I mentioned in above post?