Re: [Drakelist] T-4XC carrier in the R-4C receiver

[Garey Barrell]

Sounds like the Bias supply may have failed, or be failing.  Have you 
been able to set the transmitter idle current per the manual?.


73, Garey - K4OAH
Glen Allen, VA

Drake 2-B, 4-B, C-Line&  TR-4/C Service Supplement CDs



k...@juno.com wrote:

I recently acquired a R-4C receiver and T-4XC and the transmitter has a 
problem. With power applied to it after warm up the meter on transmitter will 
go negative to the left of zero and i get a carrier in the receiver at about 60 
db on the same frequency on both VFO's. checked all tubes and they seem to be 
OK. The carrier will change in amplitude with tuning of the final tank for max 
output. Could someone give me an idea on what to do to trouble shoot it.

Rex Meier
KQ0Z

   


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Re: [Drakelist] T-4XC carrier in the R-4C receiver

[dassaf]

> If the bias is ok, then Check the screen resistors on the final tubes.
These resistors occasionally fail.  Note:  most tube checkers do not have
the current to "check" a 6jb6 accurately.

Good luck. 


David Assaf, III
>From W5XU Desktop

-Original Message-
From: drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net]
On Behalf Of Garey Barrell
Sent: Saturday, January 23, 2010 12:04 PM
To: drakelist@zerobeat.net
Subject: Re: [Drakelist] T-4XC carrier in the R-4C receiver

Sounds like the Bias supply may have failed, or be failing.  Have you been
able to set the transmitter idle current per the manual?.

73, Garey - K4OAH
Glen Allen, VA

Drake 2-B, 4-B, C-Line&  TR-4/C Service Supplement CDs 


k...@juno.com wrote:
> I recently acquired a R-4C receiver and T-4XC and the transmitter has a
problem. With power applied to it after warm up the meter on transmitter
will go negative to the left of zero and i get a carrier in the receiver at
about 60 db on the same frequency on both VFO's. checked all tubes and they
seem to be OK. The carrier will change in amplitude with tuning of the final
tank for max output. Could someone give me an idea on what to do to trouble
shoot it.
>
> Rex Meier
> KQ0Z
>
>

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