6922, a 6DJ8 replacement?? - Page 4

mb-de · 26th February 2012, 10:17 PM

Maybe something has changed over time, but I have tested many 6N23P-EV, either in their original Saratov/Reflektor ¨MIL¨ incarnations, or as Sovtek or EH ¨6922¨ from various production runs (date codes from 1990ies to 2007), both with shiny and with grayed/blackened plates.

As a routine test, to avoid ´surprises´, I always measure the filament current at nominal filament voltage after two minutes of warmup.

For the 6N23P-EV the spread has been in the interval ´sciticen17´ mentioned in his post...

Regards,

Michael
=->
PS: (1) Interestingly, I had one batch of Russian-made (Novosibirsk 1980ies production 6N23P) ¨6DJ8/ECC88 Gold¨stamped by a well-known British rebrander, which did have filament currents in the spread 355..390 mA - in these, the actual plate construction did look markedly different from the well-known Saratovs...

PS: (2) As for DF96s post: The ECC88/6DJ8 and the PCC88/7DJ8 were originally designed for cascode stages used as VHF input stage in TV tuners, audio application had not even been an afterthought at the time of introduction.

For the E88CC/6922 the application as RF/IF Cascode or mixer stage was the foreseen prime application, but it was declared useable as well in phase inverters and in digital computer circuits as multivibrator or cathode follower...

SemperFi · 27th February 2012, 04:03 PM

Quote:

Originally Posted by scitizen17

Have you actually measured the EH6922 at 375mA? The spec sheet says "not less than 285mA, not more than 335mA". Also, the EH6922 is a 6N23P-EV clone according to the manufacturer.

Yes I have. Does EH have a datasheet for the 6922? I've only found NOS-brand datasheets for this tube.

scott17 · 27th February 2012, 04:58 PM

That's interesting about the heater current. Here are the datasheets I received from New Sensor. This is also available on the New Sensor website.

SemperFi · 27th February 2012, 06:28 PM

ok...I'm going to have to remeasure, but I'm quite sure it was 375mA.

SemperFi · 28th February 2012, 11:38 AM

Just did a measurement, and this time it settled at 329mA. Peak turn-on was slightly above 800mA and it took about 4sec to drop below 400mA.

Either the sample I measured before was odd, or I was...not sure which is most likely

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26th February 2012, 10:17 PM	#31
mb-de diyAudio Member Join Date: Dec 2007	Maybe something has changed over time, but I have tested many 6N23P-EV, either in their original Saratov/Reflektor ¨MIL¨ incarnations, or as Sovtek or EH ¨6922¨ from various production runs (date codes from 1990ies to 2007), both with shiny and with grayed/blackened plates. As a routine test, to avoid ´surprises´, I always measure the filament current at nominal filament voltage after two minutes of warmup. For the 6N23P-EV the spread has been in the interval ´sciticen17´ mentioned in his post... Regards, Michael =-> PS: (1) Interestingly, I had one batch of Russian-made (Novosibirsk 1980ies production 6N23P) ¨6DJ8/ECC88 Gold¨stamped by a well-known British rebrander, which did have filament currents in the spread 355..390 mA - in these, the actual plate construction did look markedly different from the well-known Saratovs... PS: (2) As for DF96s post: The ECC88/6DJ8 and the PCC88/7DJ8 were originally designed for cascode stages used as VHF input stage in TV tuners, audio application had not even been an afterthought at the time of introduction. For the E88CC/6922 the application as RF/IF Cascode or mixer stage was the foreseen prime application, but it was declared useable as well in phase inverters and in digital computer circuits as multivibrator or cathode follower...

27th February 2012, 06:28 PM	#34
SemperFi diyAudio Member Join Date: Jan 2002 Location: nowhere	ok...I'm going to have to remeasure, but I'm quite sure it was 375mA.

28th February 2012, 11:38 AM	#35
SemperFi diyAudio Member Join Date: Jan 2002 Location: nowhere	Just did a measurement, and this time it settled at 329mA. Peak turn-on was slightly above 800mA and it took about 4sec to drop below 400mA. Either the sample I measured before was odd, or I was...not sure which is most likely