GB> Heathkit LMO's TX vs RX tube

[Glen Zook]

According to one of my tube manuals the 6AU6 has a filament draw of 0.45 amps!  However, another one (different manufacturer) does show 0.3 amps.  Then the manual that shows the 6AU6 with 0.3 amps shows the 6BZ6 at 0.45 amps while the one that shows the 6AU6 at 0.45 amps shows the 6BZ6 at 0.3 amps.

The plot thickens!

Glen, K9STH

Website:  http://k9sth.com


--- On Tue, 4/28/09, n2ey at aol.com <n2ey at aol.com> wrote:

> From: n2ey at aol.com <n2ey at aol.com>
> Subject: Re: GB> Heathkit LMO's TX vs RX tube
> To: glowbugs at piobaire.mines.uidaho.edu, HEATH at LISTS.TEMPE.GOV
> Date: Tuesday, April 28, 2009, 5:45 PM
> -----Original Message-----
> From: Glen Zook gzook at yahoo.com
> 
> 
> >Different tubes were used in different units because of
> the series/parallel 
> >arrangement of the heater/filament string.  
> 
> 
> 
>  
> This cannot be the reason for the different tubes used in
> the various LMOs.
> 
>  
> The 6BZ6, 6CB6 and 6AU6 all have exactly the same heater
> voltage and current: 6.3 volts at 300 mA. 
> 
> 
> --- On Tue, 4/28/09, Allen Jones <w9dz at yahoo.com>
> wrote:
> 
> >>Most all of the Heath SB-301's and 401's
> use the same LMO which is part #110-40. 
> >>The LMO tube in the 301 is a 6CB6 and the 401 a
> 6BZ6. Anyone know the reason 
> >>why? 
>  
> It is my understanding that the LMOs were made by
> subcontractors to Heath specifications. They
> were viewed as a component; so different subcontractors may
> have been allowed to substitute various
> parts and tubes to keep the price down. 
> 
> 
>  
> I remember hearing, many years ago, that in those days the
> 'burden' rate on ham gear was about 100%.
> Which meant that if something were to be sold for $200, the
> direct manufacturing cost (parts & labor)
> in it could cost no more than $100. So a dollar saved in
> parts was $2 off the selling price. 
> 
>  
> Heath saved money by not having to pay for assembly or
> testing. But they had the added costs of
> designing gear that could be home-assembled & tested
> without lots of tools or test gear, writing
> detailed assembly manuals and packaging lots of parts in
> little envelopes. 
> 
> 
> 
>  
> IMHO one of the things
> that did Heath in was the printed-circuit board, because
> they reduced assembly labor so much that
> the savings of a kit were all but eliminated.
> 
> 
>  
> 73 de Jim, N2EY


      

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