GB> Heathkit LMO's TX vs RX tube

Glen Zook gzook at YAHOO.COM
Tue Apr 28 23:18:21 EDT 2009


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.  
> 
> 
> 
> 
> -----------------------------------------------------------
> Products bought, sold or traded here is the responsibility
> of the
> parties involved.  This list and the City of Tempe are not
> responsible
> for losses or misrepresentations of any kind.  Buyer
> beware!
> 
> -----------------------------------------------------------
> This list is a public service of the City of Tempe, Arizona
> -----------------------------------------------------------
> 
> Subscription control -
> http://www.tempe.gov/lists/control.aspx?list=HEATH
> To post - HEATH at LISTS.TEMPE.GOV
> Archives - http://lists.tempe.gov/archives/HEATH.html


      

-----------------------------------------------------------
Products bought, sold or traded here is the responsibility of the
parties involved.  This list and the City of Tempe are not responsible
for losses or misrepresentations of any kind.  Buyer beware!

-----------------------------------------------------------
This list is a public service of the City of Tempe, Arizona
-----------------------------------------------------------

Subscription control - http://www.tempe.gov/lists/control.aspx?list=HEATH
To post - HEATH at LISTS.TEMPE.GOV
Archives - http://lists.tempe.gov/archives/HEATH.html




More information about the Heath mailing list