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In Reply to: RE: Depends upon total dissipation, mainly. posted by drlowmu on February 06, 2016 at 18:46:34
45 Application Data (These are average normal values)
Class Va Vg1 Ia Ra S Rk Zout Pout
A S/E 250 -50.0 36.0 1,600 2.2 1,500 3,900 1.6 Watts
Exceed Any of the following and you will shorten the tube life:
2.5 Volts on the heater,
The absolute MAX voltage across the tube is 275 (Plate to filament)
Absolute MAX is 10 Watts on the plate (Tube voltage * Current).
I will bet you $1,000 your amp is violating one or more of the above to put out more power. I have 45s that have been used on and off since the 1930's.
Follow Ups:
Sorry. You just lost `$1,000.My operating points were given in my first post, above. You should have read it more carefully. I am at 6.14 Watts dissipation, while you are quoting ( 250 VDC P-K times 36 mA. equals 9.0 Watts dissipation ).
That is like going 90 MPH in a 100 MPH top-speed car. NO WAY would I ever do that, ALSO - it sounds terrible, STRESSED.
I suggested to the O.P. and am driving at 61.4 MPH, as I detailed above.
I will donate all of your payment / $1,000 check to local charities. Thank you.
Jeff Medwin
Edits: 02/07/16
You should reread his post, as he is mostly agreeing with you.
Chip647 is definitely agreeing with Jeff's assertions.
Jeff is accustomed to people giving him a hard time for his interesting theories.
Yes, I can see that, but your post was UNDER my post, as in a reply. So you were not clear as to WHO you were betting. If you posted it under the OP's post, it would be crystal clear. Have a NICE weekend Chip !
Jeff
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