Amps
[Top] [All Lists]

Re: [Amps] Alpha 76PA Conversion - Drive Issue

To: amps@contesting.com
Subject: Re: [Amps] Alpha 76PA Conversion - Drive Issue
From: "Joe Subich, W4TV" <lists@subich.com>
Date: Thu, 2 Dec 2021 17:49:59 -0500
List-post: <mailto:amps@contesting.com>

From memory it has 2500V max. and gives operating conditions for
1300W rf output.
Dated March 1983 (Class AB2, Cathode Driven, PEP conditions).

    Plate Voltage:         2500 V.
    DC Plate current        600 mA (maximum)
    Single Tone Plate I:    800 mA (short term
    Two tone Plate I:       510 mA
    Peak driving power:      36 W  (approximate)
    Single Tone Useful PO: 1370 W
    Power gain:            15.5 dB (approximate)

Dated May 1983  (also April 1987)

    Plate Voltage:         2200 V.
    DC Plate current        600 mA (maximum)
    Single Tone Plate I:    495 mA (short term
    Two tone Plate I:       313 mA
    Peak driving power:      25 W  (approximate)
    Single Tone Useful PO:  750 W
    Power gain:            15.1 dB (approximate)

73,

   ... Joe, W4TV


On 2021-12-02 5:17 PM, Steve wrote:
Somewhere I have a copy of an early release data sheet for the 3CX800 - before it was re-rated to 750W (so a pair = 1500W) to fit in with FCC rules about output specifications. From memory it has 2500V max. and gives operating conditions for 1300W rf output.

Steve G8GSQ

Eimac specified a maximum of 2250V.

73
Peter

-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of gudguyham---
via Amps

3cx800 tubes like 2600-2700 on the plates for maximum gain.   2000 volts is a bit anemic for 3cx800 tubes.

_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
<Prev in Thread] Current Thread [Next in Thread>