[Hammarlund] SP-210SX power supply

[Bob Young]

Well so far so good, I was lazy and left the link in and brought it up very 
slowly to about 100 volts using the 125 V tap and the B+ was already at 280, 
the neg. bias was only -20 though so I'm going to put the resistors I bought 
in series and bring it back up again tomorrow. No smoke, no problems, no 
sound though but I think a few of the tubes are bad, even all the panel 
lights worked. The S meter jumped when I switched the crystal filter in. 
Anyone know of any sources for the 50 H choke?, and the original is actually 
a big transformer isn't it? If I remember right my SP-400 power supply has 
three transformers instead of the two this one has and there is space and 
holes for another.

Bob Young
Millbury, Ma


----- Original Message ----- 
From: "Chuck McGregor" <cbmcg at comcast.net>
To: "Bob Young" <youngbob53 at msn.com>
Sent: Saturday, April 15, 2006 2:09 PM
Subject: Re: [Hammarlund] SP-210SX power supply


> Bob-
> With a shorting link, I would expect the 270volt and  140volt B+ lines to
> be way high.  Later SP-200 power supplies used a 50 H choke with a dc
> resistance of 1150 ohms in place of the field coil.  I would suggest using
> a 1.2Kohm 15watt power resistor rather than a shorting jumper.
>
> Be sure that the -50v bias supply is present anytime you power up the
> SP-200.  Without it, the 6F6 audio driver stage is unbiased, and will burn
> out the audio driver transformer.
>
> BTW  TM11-866 for the military SP-200's (BC779) is as very good
> manual,  and a good scan of it is in the KG7BX archive at BAMA.  The  .pdf
> version is recommended.
> http://bama.edebris.com/manuals/military-kg7bz/bc779/
>
> 73,
> Chuck N7RHU
>
> At 10:20 AM 4/15/2006, you wrote:
>
> >I've just received an SP-210SX, and the power supply has an output for a
> >field coil speaker (speaker field) which has a shorting link attached 
> >across
> >the terminals, before I power this thing up is that correct? thanks,
> >
> >Bob Young
> >_______________________________________________
> >List Administrator: Duane Fischer W8DBF
> >** For Assistance: dfischer at usol.com **
> >----
> >http://mailman.qth.net/mailman/listinfo/hammarlund
> >
> >
> >
> >--
> >No virus found in this incoming message.
> >Checked by AVG Anti-Virus.
> >Version: 7.1.385 / Virus Database: 268.4.1/312 - Release Date: 4/14/2006
>
>
> -- 
> No virus found in this outgoing message.
> Checked by AVG Anti-Virus.
> Version: 7.1.385 / Virus Database: 268.4.1/312 - Release Date: 4/14/2006
>
>
>