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In Reply to: RE: Problem after tube change posted by Chip647 on February 06, 2015 at 05:16:06
I reinstalled the original tubes one at a time and checked to see if the noise went away. Nope. I cleaned the pins and the sockets, made sure they were seated well.
A couple of pieces of info: The noise is in both channels equally. It gets louder with the volume control. The putt-putt is a constant and a regular beat. Nothing else has changed in the unit that I know of.
Thx,
GP
Follow Ups:
GP
what kind of preamp is this? You are going into motorboating because the regulator is responding to a voltage change and it's keeping the preamp in a semi-shutdown mode.
"If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
- Daniel R. von Recklinghausen
Michael,
The preamp is an Aikido-based unit that was built for me about eight years ago. I returned the original tubes to their initial positions and the motorboating continued.
Most likely your problem is coincidental to your tube change. What you have is something in your power supply, most likely your B+ supply, is on the fritz. Could be a bad connection, a bad resistor, a bad cap, a bad transformer.
I'm no kind of technician either, but this putt-putt you're describing sounds like what a tech might refer to as motorboating. If so, could be a blown resistor or maybe a bad cap? Maybe some of the smart people here like Mr. Samra can chime in with some help. Sorry for your trouble. I know how bummed I feel when one my amps gives me issues.
Edits: 02/06/15
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