GB> Heathkit LMO's TX vs RX tube

[Glen Zook]

The 6AU6 which is also used does have a different filament current.

Glen, K9STH

Website:  http://k9sth.com


--- On Tue, 4/28/09, Allen Jones <w9dz at YAHOO.COM> wrote:

> From: Allen Jones <w9dz at YAHOO.COM>
> Subject: Re: [HEATH-TEMPE] GB> Heathkit LMO's TX vs RX tube
> To: HEATH at LISTS.TEMPE.GOV
> Date: Tuesday, April 28, 2009, 6:04 PM
> I understand what you say except that the filament voltage
> and draw are the same for both according to my GE tube
> manual, 6.3 V at 0.3 Amps.
> 
> Oh well, guess it doesn't really matter. Just intrested
> why. I have two pair of twins, one set from 1968 and the
> other from 1972. They all use the same LMO. Both TX's
> use 6BZ6's and the RX's 6CB6's. That also agrees
> with the manuals and the parts list.
> 
> I applied power to the spare I got off eBay last evening. I
> checked the frequency with my counter after 10 minutes and
> then an hour or so later. I only moved 75 Hertz. Not bad for
> something built 40 years ago!
> 
> 73,
> 
> Allen, W9DZ
> 
> --- On Tue, 4/28/09, Glen Zook <gzook at yahoo.com>
> wrote:
> 
> > 
> > Different tubes were used in different units because
> of the
> > series/parallel arrangement of the heater/filament
> > string.  Tubes with equal current draw had to be put
> in
> > series for operation from 12.6 volts instead of 6.3
> > volts.  
> 
> 
> 
> 
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