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

Wed, 20 Aug 2003 15:16:07 -0700

Arrrggg....I remember now.....I use the same tube socket to do the
matching for each tube so the value of the cathode resistor does not
matter as long as the resistor itself is within it's tolerance.

Regards

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

-----Original Message-----
From: [email protected] [mailto:[email protected]]
On Behalf Of Mark NAce
Sent: Wednesday, August 20, 2003 2:10 PM
To: David Harmon; [email protected]
Subject: Re: [Drake] Matching 6JB6's with a Tube Tester

Great point!  Would be nice to have a test jig with precision cathode
resistors (ohm'd out to check them of course !)
mARK
----- Original Message -----
From: "David Harmon" <[email protected]>
To: <[email protected]>
Sent: Wednesday, August 20, 2003 12:10 PM
Subject: RE: [Drake] Matching 6JB6's with a Tube Tester

> 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
>
>
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