Hi!
I know it is normal that the powertubes glows blue. But is that normal that V4 glows blue and V5 not, when guitar is played. V5 starts glowing blue and V4 not when guitar is not played?
The amp is Plexi 50W.
All voltages are normal and bias is correct. Sound is normal too.
Blue glow
Moderator: VelvetGeorge
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54strat
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Re: Blue glow
Blue-ish glow is nothing to worry about.
73 Marshall 1987
76 Marshall 1936 cab w/Celestion V-30's
54 Fender Stratocaster hardtail
87 Fender Stratocaster
76 Marshall 1936 cab w/Celestion V-30's
54 Fender Stratocaster hardtail
87 Fender Stratocaster
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toner
- Senior Member
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- Location: Iowa
Re: Blue glow
Not sure how accurate this is but:
http://thetubestore.com/blueglow.html" onclick="window.open(this.href);return false;
It is common for the V4 side (or V4/V5 in a 100w) to receive a stronger input signal due to how the PI is not perfectly balanced. Honestly, I'm not sure about the technical details of how this relates to "blue glow" but that side usually works harder in a Marshall. That's why it is usually best to put "colder-biased" tubes on that side if the two halves are not well matched. If voltages and bias are okay, don't worry about it!
http://thetubestore.com/blueglow.html" onclick="window.open(this.href);return false;
It is common for the V4 side (or V4/V5 in a 100w) to receive a stronger input signal due to how the PI is not perfectly balanced. Honestly, I'm not sure about the technical details of how this relates to "blue glow" but that side usually works harder in a Marshall. That's why it is usually best to put "colder-biased" tubes on that side if the two halves are not well matched. If voltages and bias are okay, don't worry about it!
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Ukko75
- New Member
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Re: Blue glow
Thanks you guys wery much for releafing information!