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

Wed, 20 Aug 2003 16:10:26 -0500

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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