[Amps] 8877 Plate Voltage

[Carl]

----- Original Message ----- 
From: "Jim Thomson" <jim.thom at telus.net>
To: <amps at contesting.com>
Sent: Monday, July 02, 2012 10:03 PM
Subject: [Amps] 8877 Plate Voltage


> Date: Sun, 1 Jul 2012 15:20:04 -0400
> From: Steve Bookout <steve at dx4win.com>
> Subject: Re: [Amps] 8877 Plate Voltage
>
> I second that!
>
> I've been running one @4200, or so, since '85 with no issues.
>
> 22 watts in gives me 1500 out. A 3 db pad sure would make it less touchy, 
> when tuning.
>
> ##  22 in and 1500w out = 18.34 db gain.   Use a parasitic suppressor..and 
> a glitch R. .
>
>
> 73 de Steve, NR4M
>
>
> ##  I thought the 8877  required more drive than that...like 60w.
> I heard  that once the B+  gets up above 3900....that the gain of the tube 
> increases  a whole bunch.
> Plan B is to use a pair of tubes..and run em at 3-5 kw pep out.
>
> ##  IF a pad is used,  insert it inside the RF deck... just prior to the 
> tuned input.    Then the pad is
> not in the circuit on RX.
>
> Jim  VE7RF


You can also put the pad right at the cathode and get the benefit of some 
NFB.

Carl
KM1H