Drake T4X finals - substitutions?

[Torres, Alfonso R.]

Bob:  Before you replace the 6BJ6 on the Drake unit, you better follow the
procedures for neutralizing the unit.  At the higher frequencies, the Drake
manual tells you such procedure.  If you go to 10 meters, without
neutralizion, there is a good probability that the unit will oscillate.

Another nice replacement, no mods, for the 6JB6 is a 6KM6 which is 100%
compatible and you will get a few more watts of output per tube.

Salutations,

Al KP4AQI

Dr. Al Torres
Manager, RF/Analog Engineering
Xetron
460 W. Crescentville Rd.
Cincinnati, OH 45246
(513) 881-3282 Office. (513) 881-3237 FAX
(937) 236-2534 (Home) / atorres at coax.net (Home)
(937) 287-4912 Cell; Pager(Toll Free): (866) 218-6251
Archwireless: 8662186251 at archwireless.net
"A Smile is a curve that makes most things straight"


-----Original Message-----
From: Bob And Bettina Groh [mailto:rgroh at SWBELL.NET]
Sent: Thursday, June 26, 2003 10:54 PM
To: BOATANCHORS at LISTSERV.TEMPE.GOV
Subject: Drake T4X finals - substitutions?


A good friend just put his 'new' T4XB on the air and he has a question
on substituting 6146's for the finals - see his email below.

> Hi Bob, Well I put the T4XB and power supply together last night for a
test .
> Power out a little low on 80 and 40 meters.
> Drops off really low 20 meters and above.  I suspect the 6JB6 finals.
Since they are the hottest failure item.
> Checking on prices of them on the net.
> Mostly EXPENSIVE!  Going to have to shop around.
> Sylvanias and RCAs seem to be the tubes of choice.
> There is a guy selling kits to do a 6146W mod. And he guarantees it.
> Thought for now though I would try to get it working with 6JB6s
> 73

Has anybody tried this or have any recommendations along this line?

73
Bob Groh, WA2CKY

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