#5291
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I have RCA 6F6G and 6F6M and use a 5U4G rectifier with the tubes. Also have used a 5Y3GT which produces a warmer sound. Prefer the 5U4G punch and bass control.
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#5292
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I also use a 5U4G with the 6F6. Dennis recommends this combination.
The best output tubes I have heard in my Firebottle. Surprising bass. |
#5293
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rectifier tubes
I haven't tried the 5U4 rectifier with the RCA 6F6 metal cans. Will give it a try. I have been running 5AR4 in my Triode SET with IIps. Probably running the 6F6's too hard with the 5AR4 - it does sound nice though with this combination.
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#5294
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It confuses me to use a 5u4 with lower power tubes, since 5u4 tubes are 3amp, and 5r4 tubes are 2amp. I guess the 2amp rectifiers have higher voltage output tho?
Found this chart online. Maybe somebody that knows more can shed some light onto this. |
#5295
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If, in a darkened room after the amp has warmed up, the tubes are not red plating all should be well.
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#5296
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True, except in this case where we are using metal tubes.
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#5297
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Quote:
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#5298
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for those with one of Dennis' amps with the B+/AC switch on the front, are you all leaving the amp powered up with B+ voltage to keep the heaters on or do you cut all power with the rear switch? I thought I read Dennis recommends just leaving it with B+ on 24/7.
Is it normal to hear speaker hum with B+ only? |
#5299
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Hey pechelman, with the B+ off there is some magnetic field pick up from the power transformer.
With the B+ in the on position with the amp operating, DC current is flowing through the output transformers and the hum will be eliminated. |
#5300
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I should add this as well...
The B+ switch on and off is provided to allow filament warm up of New old stock or used 45 tubes from many years ago. This allows filament conditioning of 45 tubes that may be up to 70 years old, (without applying B+), this allows the tube to come to life slowly. Of course with new production 45 tubes it is not be necessary to have the B+ switch. |
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