[AMRadio] Subj change - HB designs


Brett gazdzinski brett.gazdzinski at verizonbusiness.com
Mon Jul 30 08:34:42 EDT 2007


Think that circuit is better then a hifi transformer
(say 2500 ohms center tapped) to 8 ohms?
8 ohm side goes to the hifi amp, the 2500 ohm
side goes to the grids.
Swamping resistors go across the 2500 ohm side
(1250 ohms to center tap)

Brett
N2DTS
 

> -----Original Message-----
> From: amradio-bounces at mailman.qth.net 
> [mailto:amradio-bounces at mailman.qth.net] On Behalf Of Geoff/W5OMR
> Sent: Thursday, July 26, 2007 10:25 AM
> To: Discussion of AM Radio in the Amateur Service
> Subject: Re: [AMRadio] Subj change - HB designs
> 
> W5OMR wrote:
> >> The more I think about it, the more I like that idea.  a 
> single 4-125, 
> >> modulated by (4) 811's in push-pull parallel with the 
> option of going up 
> >> to a 4-250 or even a 4-400.
> 
> > Brett gazdzinski wrote:
> >> With 4 tubes to drive, it takes a lot of clean low 
> impedance power to drive class b triodes.
> 
> http://www.qsl.net/wa5bxo/driver1.html
> 
> --
> 73
> 
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