[AMRadio] Good solid state/hybrid rigs for AM use


Brett gazdzinski Brett.gazdzinski at mci.com
Fri Jan 13 14:33:34 EST 2006


I do not think it's a good idea to run tube rectifiers or use the resistors.
The filament power is a major chunk of the low voltage transformers
wattage rating, and they frequently burned up in the past.
The resistors would do nothing but make the B+ regulation poor.
The power supply uses choke input, and has no problem with spikes.
The Peter Dahl catalog used to list ONLY the low voltage transformer
for the 32v series rigs. I would guess it was the only one that ever blew
out.

I have been running my 32v3's with solid state rectifiers in place of the
high, 
low, and bias rectifier tubes, on the high voltage tap, with an extra 25mf
tacked on
to the b+, with zero problems for the last 15 years....

I even ran the things at 1000 volts B+ without any problems.

Just my two cents...

Brett
N2DTS

  

> -----Original Message-----
> From: amradio-bounces at mailman.qth.net 
> [mailto:amradio-bounces at mailman.qth.net] On Behalf Of Brian Carling
> Sent: Friday, January 13, 2006 1:48 PM
> To: Discussion of AM Radio
> Subject: Re: [AMRadio] Good solid state/hybrid rigs for AM use
> 
> Mike - there is not any reason to think it wouldn't work fine
> if you went to solid state rectifiers and put a 30-40 ohm resistor 
> in series with each, and use an inrush protector on the primary 
> of the  plate transformer.
> 
> Nothing wrong with tube rectifiers either for that matter!
> 
> On 12 Jan 2006 at 18:43, Mike Dorworth, K4XM wrote:
>  
> > > Keep in mind, when you run the 32V2, you should get 80/90 watts
> > > out in the high voltage position (and should have solid 
> state rectifiers),
> > > but running an ft101, and others of its ilk, you get 
> about 20 watts out.
> > 
> > My 32V3 gets 107 (exactly) watts out in HV position with 
> 121 volts AC input
> > and using the original tube rectifiers. I would be afraid 
> to use solid state
> > rectifiers even though I have them on hand. Maybe some day 
> when the tubes go
> > bad and I use LOW voltage I will try them.With 2 used, 1 
> new 4D32 tube I get
> > the the same results.. 40 meters as reference.
> > I get good reports on a TS-570D with a 444D mike using a 3 
> tube 811A amp. It
> > all works if not overdriven.. 73 Mike
> > 
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> 
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