Hello everyone, I was too busy yesterday to relay any detailed information about amplifier heat.
The KT88's are the reason the unit is slightly hotter than with smaller tubes, this is normal and the amp is fine. The power transformer is rated to 103° Centigrade (217° Fahrenheit). |
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The Philips ECG 7581a is one of the best sounding 6l6 variants on the planet in these amps. The only tube I’ve used in both my 6FLV and my universal that bested them (and I have tried everything out there in both amps) were WE350b’s in the 6FLV. The Philips are pretty rare and pricey but worth it if you can find them. (Green letters, dual top getters, 80’s production) Believe it or not the Tung Sol new production 7581a is no slouch either. |
Ok, forget everything I said...
The power transformers are rated to 103° Centigrade which is 217° Fahrenheit. |
Believe it or not the Tung Sol new production 7581a is no slouch either.[/QUOTE]
That's the ones I ordered from Viva be here Tuesday Thanks Rich |
Straightwire, you seem to know what's what. Will the amp tend to run cooler running KT77 or KT66?, or EL34?
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Hey paulmlemay, If you run a tube with a lower filament current the unit will run cooler.
The filament current on the KT88 is 1.6 amps the KT77 is 1.4 amps and the EL34 is 1.5 amps. The 6L6 is one of my favorites and draws .9 amps. The 6V6 draws .45 amps. The 6F6 draws .7 amps. (try some metal ones, you might like 'em) Use 5U4 and 5Y3 rectifiers with the 6L6, 6V6, and 6F6. And on a side note concerning rectifiers, the difference in voltage on the plates of the output tubes (B+) is a 5AR4 is around 35 volts higher than a 5U4 and a 5U4 is around 30 volts higher than a 5Y3. The input tube plate voltage is regulated so it doesn't really change much (a couple of volts) when you change rectifiers. Hope this info helps. |
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I prefer the lower power tubes too. However, KT88's in triode are sweet. |
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As I understand it, Universal is a triode wire amp with opt NOT optimized for any given tube. 6V6er is Pentode optimized for tubes like 6v6, 6f6 and 6l6. The PT on the 6v6er is the significant difference from the 6flv. Dennis once told me the design changes but I do not remember them. |
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