Choke or cap input filter?
Carl
KM1H
----- Original Message -----
From: "Charles Bibb" <zedkay@telepak.net>
To: <amps@contesting.com>
Sent: Sunday, January 23, 2011 3:34 PM
Subject: [Amps] SR-410A
>
> Hi, All
>
> I need a little help from you guys more familiar with commercial gear
> than I am. Recently I was given (most of) a Scientific Radio Systems
> SR-410A VHF power amp and power supply. The amp uses a single 8877
> tube. I do not have the manual. Does anyone know what plate voltage
> this amp runs on the tube?
>
> I've removed the HV transformer and have run it with only a few volts
> on the primary, instead of 234V, and even with a small load on the
> secondary I get a transformation ratio of 1 to 13.25. Using 234V on
> the primary, this would yield 3100V on the secondary. This voltage
> run through a bridge rectifier and filter would result in nearly
> 4400VDC key up on the plate. Is this correct for this amp? Seems a
> tad high considering that the maximum rated plate voltage on the 8877
> is listed as 4000V.
>
> The transformer is a Basler Electric EB3041*001. The asterisk stands
> for a number that I cannot read because it has been rubbed off. Does
> anyone have a wiring diagram for the primary taps on this particular
> transformer? It appears to be a dual winding primary, with the
> windings connected in series, and with several other tap positions
> allowing for other voltages. If this one was run from 208V, the
> secondary would be approx. 2760V, and after rectification and
> filtering, 3900VDC. That sounds more like it.
>
> Any info?
>
> TIA and 73,
> Charles - K5ZK
>
> _______________________________________________
> 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
|