76 operating point/max plate rating?

[kegger]

I'm having difficulty tracking down the max plate ratings and looking
for suitable max or upper end operating points.

I see very little on the web of people running these tubes so I have
no real guideline of what others have ran them at.

Going by tdsl or the published PDF's it would seem a pretty low plate
dissipation rating as max that I see suggested is 250v at 5ma while
a 37 I see 250v and 7.5ma but still no max plate disipation rating.

I found 1 reference to an amp that was running a 76 at 10ma and at
250v on the plates but still no mention as to how hot they were ran.

I'm currently running them at about 8.5ma and 233v on the plates in
a preamp that does sound quite nice but I'd like more info then I find.

Thanks in adavance to any and or all info anyone may care to share.

 

[AndreasS]

...plate dissipation rating as max that I see suggested is 250v at 5ma...

This is correct.

Andreas

 

[kegger]

I don't think that is a max plate rating but more of a suggested operating point?

 

[AndreasS]

Yes, the maximum plate dissipation is 1,25 Watt.

Andreas

 

[kegger]

Curious, is that published somewhere?

 

[AndreasS]

Yes, it is, but I must seek the book.

Andreas

 

[AndreasS]

Source: Mikolajczyk and Maszkowski: Universal Electronic Vade-mecum, P. 33

Andreas

 

[kegger]

Thank yu sir!