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In Reply to: RE: So what have I got wrong this time? posted by deathtube 667 on May 24, 2016 at 17:37:44
Thats true. If I put a sine wave through the amp it should be bigger after the second 26 than after the first. I will give that a try tomorrow.
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400VDC seems kind of high for a non-DC coupled 45 final.
What is the Vp-k and bias current?
I run my 45's around 275Vp-k @ 37mA.
275 VDC times 0.037A. is 10.175 Watts continuous dissipation for a tube whose maximum plate dissipation is 10 Watts. No need to hotrod the Type 45 tube, dissipation-wise, and KILL tube life as you are doing it !!!
Consider running tubes at their Golden Ratio percentages of dissipation, for HUGE tube life, and beneficially, a LESS THERMALLY STRESSED sound to your ears.
In Golden Ratio terms, a 10 Watt MAXIMUM plate dissipation Type 45 may be nicely run at about 62% ( Golden Ratio percentage ) or 6.2 Watts.
A suggestion, run 45s at 250 and maybe 25 mA. which equates to 6.25 Watts. It will be less stressed sounding, and IF your wiring and supply is good, no loss of performance will be had.
An analogy, your car may be capable of running at 100 MPH, but it will do CONSIDERABLY better running it at 62 MPH continuously !!
Have fun, I am.
Jeff Medwin
Going to check on this. Got the same comment above.
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