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.
73 de Steve, NR4M
On Jun 30, 2012, at 18:50, "Jim W7RY" <jimw7ry@gmail.com> wrote:
> It will be VERY EASY to drive at this voltage. Probably around 25 watts for
> 1500 out if it’s a good tube. I'm thinking of putting a 3 or 4 dB attenuator
> into the input to get the drive up to around 70 watts or so. Mine runs 4100
> volts no load.
>
> 73 and good luck!
> Jim W7RY
>
>
> -----Original Message-----
> From: Charles Bibb
> Sent: Saturday, June 30, 2012 2:33 PM
> To: amps@contesting.com
> Subject: [Amps] 8877 Plate Voltage
>
>
> Starting a new project.
>
> I'm collecting parts for a new HB 8877 amp. One really nice part
> that I've recently acquired is a massive transformer for the HV
> supply. This transformer came out of a commercial FM transmitter
> that ran an 8877 at 1 kw continuous duty.
>
> While that power supply used a choke-input filter in the HV supply, I
> want to run the higher voltage obtained by a cap.-input filter. With
> a cap.-input filter, however, the HV supply will be a tad over
> 4150VDC, using the "best" primary taps available. Can wire for
> higher, but not any lower.
>
> My question(s) is/are: How critical is Eimac's "absolute maximum
> ratings" as far as plate voltage is concerned. I know that under
> load, with acceptably regulation, the plate voltage will be about
> where I want it at 3800V. Is the slightly-too-high potential on the
> anode under no-load a problem? Or, should I just not worry about it
> and "let 'er rip, tator chip".
>
> Anyone have experience here?
>
> 73,
> Charles - K5ZK
>
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