Re: [Drakelist] Question regarding TR4

[Garey Barrell]

Kevin -

Your radio is a Version 2, probably built mid 1966.

Drake switched from 12BA6 to 6BA6 in Version 5, (4/68,) and to 6BZ6 in 
Version 6, (10/68,) at V5.


12BA6 to 12BZ6 in Version 4, (9/67,) and to 6BZ6 in Version 5, (4/68,) 
at V11.


V12 and V15 were 12BA6's for the entire production.

Your CD went out yesterday via First Class Mail.

73, Garey - K4OAH
Glen Allen, VA

Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
www.k4oah.com


Kevin Elliott wrote:
While I wait for my repair CDs to arrive I have found something I need 
some information on.  I am in the process of retubing the TR4 I have 
and I went down the list of tubes in the voltage chart and ordered all 
of the tubes.  That I think is my first mistake because when I took 
the cover off and got ready to install the tubes the first one was a 
6BZ6 tube I come to find out there are none in use on this particular 
radio.  Am I safe to assume that they made a revision either before 
this radio or afterwards and went to the 12BA6 tubes which I am 
finding are getting hard to find. My radio shows that tubes V13, V12 
and V11 are all 12BA6 and it has arrows pointing to all three tubes.  
The serial number on the radio is 23567 so if anyone can tell me what 
year that is I would appreciate it.

Thanks and 73
Kevin


___
Drakelist mailing list
Drakelist@zerobeat.net
http://mailman.zerobeat.net/mailman/listinfo/drakelist
   


___
Drakelist mailing list
Drakelist@zerobeat.net
http://mailman.zerobeat.net/mailman/listinfo/drakelist

[Drakelist] TR-4 problem

[Kirk Smith]

Here is a strange oneWhen I turn on my TR-4, the s meter does the normal 
thing by running up to max scale, but instead of dropping right back downit 
hangs, with no audio or signal. With that being said, it will start do drop 
very 
slowly, over a period of about three minutes...with the audio  signal 
increasing as it drops. After the three minutes or so pass by, everything seems 
to be working normal. One other thing that I see is, the AGC is much slower 
while the audio  signal are coming up, and after everything is running 
somewhat 
back to normal...ha, ha..the AGC is much faster (not choppy...but not slow 
like I would expect it to be) All of this being said, I've only had this rig 
for 
a week now  am still getting used of it! In the past I've had BC twins, so I 
do know that during warm upthe meter will raise then fall within a few 
seconds or so.any ideas?
Thank you
Kirk


  ___
Drakelist mailing list
Drakelist@zerobeat.net
http://mailman.zerobeat.net/mailman/listinfo/drakelist