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previous: Stefan Hello,My Amp sounds... -- 3/8/2000 10:49 PM view thread

Re: Marshall 2204 sounds ugly, tubes?

3/9/2000 12:53 AM
Trace
Re: Marshall 2204 sounds ugly, tubes?
quote:
"I removed the low input jack network and go now from the frist stage out via .022uF to the preamp-pot."
 
 
You may be having a problem if the 470K/470pF combo is not in the signal path. The 470K (R5) with the 470pF (C4) cap in parallel needs to be there or you will get an ugly sounding "distortion" behing the regular tone. I would put the 470K/470pF combo back in (unless of course I'm reading your post wrong)  
 
 
quote:
"The pre-amp tubes are now at least 9 years old but I thing, that they are still the first tubes,  
means 19 years old."
 
 
I would really change those pre-amp tubes because that's pretty old. I normally suggest changing them once a year for moderate playing time (weekends) but it depends on the quality of preamp tubes.  
 
quote:
"The amp was not played often, maybe 1200 hours all over."
 
 
I'd change the preamp tubes and go with a good set.  
 
quote:
"replace the preamp tubes because of there age.  
witch tubes are good? (12ax7)"
 
 
Groove Tubes, Sovtek, NOS RCA, it sounds like anything would be better than what you have in there now. I would suspect the preamp tubes are pretty "tired" sounding.  
 
Let us know what happens;  
Trace  
 

 
Replies:
Stefan High trace,after ch... -- 3/9/2000 11:57 PM