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Grunow 654
#25

(07-05-2015, 09:51 PM)vecher Wrote:  I did check the tubes. All were Good.  However when checking them against schematic I noticed that I have a 6K6G in the place of a 6F6G. I believe it is a direct replacement but how it affects the voltage   No clue..

I lowered the input voltage to 117 volts. The B+ now reads + 330 volts using a VTVM.. The bias reads -.68 volts..  Radio still works great.. So I guess its good for now..  I guess I will put it back in cabinet and back to living room..

Thanks all

Skip...

Skip;
  I think that we have found the answer as to why the B+ voltage is higher, lower current output tube. Find either a 6F6 or a 6V6 to replace the 6K6G, the 6K6G is not a direct replacement, the plate and screen current is lower then the 6F6 or the 6V6, and the heater current is also lower, the plate impedance is also wrong.
Regards
Arran


Messages In This Thread
Grunow 654 - by vecher - 06-21-2015, 11:36 PM
RE: Grunow 654 - by Arran - 06-22-2015, 02:13 AM
RE: Grunow 654 - by Radioroslyn - 06-22-2015, 06:03 AM
RE: Grunow 654 - by vecher - 06-22-2015, 05:38 PM
RE: Grunow 654 - by vecher - 06-22-2015, 09:35 PM
RE: Grunow 654 - by Arran - 06-23-2015, 12:26 AM
RE: Grunow 654 - by Warren - 06-22-2015, 10:46 PM
RE: Grunow 654 - by jerryhawthorne - 06-22-2015, 11:17 PM
RE: Grunow 654 - by mikethedruid - 06-22-2015, 11:55 PM
RE: Grunow 654 - by vecher - 06-23-2015, 08:51 AM
RE: Grunow 654 - by vecher - 06-23-2015, 07:18 PM
RE: Grunow 654 - by Arran - 06-23-2015, 11:57 PM
RE: Grunow 654 - by codefox1 - 06-24-2015, 07:17 AM
RE: Grunow 654 - by vecher - 06-24-2015, 02:23 PM
RE: Grunow 654 - by Arran - 06-25-2015, 12:45 AM
RE: Grunow 654 - by jerryhawthorne - 06-24-2015, 02:50 PM
RE: Grunow 654 - by vecher - 06-24-2015, 03:14 PM
RE: Grunow 654 - by vecher - 06-26-2015, 03:57 PM
RE: Grunow 654 - by vecher - 07-04-2015, 03:52 PM
RE: Grunow 654 - by Radioroslyn - 07-04-2015, 04:58 PM
RE: Grunow 654 - by vecher - 07-04-2015, 07:57 PM
RE: Grunow 654 - by vecher - 07-04-2015, 10:37 PM
RE: Grunow 654 - by Arran - 07-05-2015, 01:12 AM
RE: Grunow 654 - by vecher - 07-05-2015, 09:51 PM
RE: Grunow 654 - by Arran - 07-06-2015, 02:06 AM
RE: Grunow 654 - by vecher - 07-06-2015, 09:05 AM



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