From: Garey Barrell 
Subject: Re: [drakelist] 6EV7 vs 6FQ7


Garey Barrell  made an utterence to the drakelist gang
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Joe -

Yes and yes.

Drake was unable to get 6EV7s in production quantities and so switched 
to the 6FQ7s.  It shows in schematic 10077626670, but was used 
"unofficially" before that.  There were a couple of resistor changes as 
well, e.g., a cathode resistor was used with the 6EV7 and removed with 
the 6FQ7, but Drake didn't recommend any changes when swapping tubes.  
Both are readily available today for replacement purposes, ESRC lists 
them at $4 and $8 respectively.  The 6AQ8 was even used for a while, but 
had a different filament current and since the T-4X used a 
series-parallel filament arrangement you had to add a current equalizing 
resistor. 

73, Garey - K4OAH
Atlanta

J Roth, N4ARI wrote:

>
> "J Roth, N4ARI"  made an utterence to
the drakelist gang
> ----------------------------------------------------------------------
> In my T4XC, my manual says V10 (for VOX) is a 6EV7 but the label on 
> the chassis shows a 6FQ7. The tube in the radio was verified as a 6FQ7.
> Was there a change in production somewhere? Are these tubes 
> interchangeable?
> Joe
>
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