[Drake] Matching 6JB6's with a Tube Tester

Wed, 20 Aug 2003 10:10:38 -0700

You're right Andy....it was so obvious that I didn't bother to mention
it!!

Regards

Dave Harmon
NSRCA 586
[email protected]
Torrance, Ca.

-----Original Message-----
From: [email protected] [mailto:[email protected]]
On Behalf Of Andrew Siska
Sent: Tuesday, August 19, 2003 8:31 PM
To: [email protected]
Subject: RE: [Drake] Matching 6JB6's with a Tube Tester

If you are going to use this method (voltage drop across cathode
resistors) to match tubes, make sure you measure the resistance of each
cathode resistor so you can calculate the actual value of current.  A
similar voltage drop across dissimilar resistances doesn't mean the
current is the same through each resistor.  This is probably obvious but
it might not be during the rush to get a rig back on the air.

73
Andy / N9CU

-----Original Message-----
From: [email protected] [mailto:[email protected]]
On Behalf Of David Harmon
Sent: Tuesday, August 19, 2003 7:40 PM
To: 'Mark NAce'; [email protected]
Subject: RE: [Drake] Matching 6JB6's with a Tube Tester

I used the cathode method in a TR-4CW. The tube tester probably would
work but I would rather match em' where I use em'. Measure the voltage
drop across the cathode resistor for each tube. You really must have a
digital readout voltmeter for this because you will need to read the
voltage in 'tenths' of a volt.

Regards

Dave Harmon
NSRCA 586
[email protected]
Torrance, Ca.

-----Original Message-----
From: [email protected] [mailto:[email protected]]
On Behalf Of Mark NAce
Sent: Tuesday, August 19, 2003 4:44 PM
To: [email protected]
Subject: [Drake] Matching 6JB6's with a Tube Tester

Dear group,
I have seen several folks mention that Drake finals can be matched using
a good tube tester like a 6000A or TV.  I have also heard that Drake
used to match their finals with a testing setup that used the same plate
& screen voltages, bias, etc. as a working rig, by measuring the cathode
current.  Does anyone have an opinion?  
Thanks for your time
Mark, N5KAE

--- StripMime Report -- processed MIME parts --- multipart/alternative
  text/plain (text body -- kept)
  text/html
The reason this message is shown is because the post was in HTML or had
an attachment.  Attachments are not allowed.  To learn how to post in
Plain-Text go to: http://www.expita.com/nomime.html  ---
_______________________________________________
Drake mailing list
[email protected] http://mailman.qth.net/mailman/listinfo/drake

_______________________________________________
Drake mailing list
[email protected] http://mailman.qth.net/mailman/listinfo/drake

_______________________________________________
Drake mailing list
[email protected]
http://mailman.qth.net/mailman/listinfo/drake