Assistance with possible Loop and Tube issue

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Mungo Zen

Well-known member
Joined
Jun 25, 2008
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Location
Vancouver B.C. Canada
Hello!

I have an issue I think i have isolated and am looking for a second opinion.

Perceived Issue: When running the Effects Loop there is a loss of tone and power, sluggishness in the lows and a loss of some harmonics

Theory: V4 and V6 12AX7 need to be replaced

Testing:
Stripped everything down to Guitar -> Amp -> Cab (This includes 0ing out the Loop Volume, turning off reverb, etc)
Disabled Effect Loop by Toggle
Hard Set Channel 3 on back
Set Tone and Note Volume
Engaged Effect Loop Toggle and bring Master Volume up to match above step

I repeated this in all three channels in 45 Watt

Findings: Most notably in Channel 2 and 3, when engaging the Effect Loop I had the above symptoms and have come to the conclusion it is the Tubes. Looking for feedback that confirms or suggest an alternative I should look at.
 

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