{Collins} 812 vs 811 Transmitting Tubes

[Paul Kraemer]

No. the 811 is a HIGH MU triode having a gain of 160. The 812 is a LOW MU 
triode with a gain of 29.
Other than that VERY significant difference they are physically same
RCA transmitting tube manual TT-5
Paul K0UYA
----- Original Message ----- 
From: "David Hollander" <n7rk at cox.net>
To: <collins at listserve.com>; <amswap at mailman.qth.net>; "BOATANCHORS" 
<boatanchors at mailman.qth.net>; "Old Tube Radios" <boatanchors at theporch.com>; 
<BOATANCHORS at LISTSERV.TEMPE.GOV>
Sent: Wednesday, May 28, 2008 10:10 AM
Subject: {Collins} 812 vs 811 Transmitting Tubes


> Looking at the data sheets, the 811 and 812 look to be nearly identical.
>
> Can you replace 811's with 812's in an amp such as a 30L-1 or any other 
> amps that use 811's?
>
> Any comments?
>
> 73 es Tnx,
>
> Dave N7RK
>
> -- 
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