Testing an E288CC (8223)

jlsem · 2nd September 2007, 02:25 AM

Does anyone have tube tester parameters for this tube? A friend of mine has a bunch that he wants to test. He has a Hickock 539 and a military TV-10. I have a TV-7 and a Hickock 123 Card-Matic.

John

EC8010 · 2nd September 2007, 08:03 AM

Well, the pin-out is the same as an E88CC, mu and gm are pretty similar but it's a bit beefier, so testing as an E88CC would be a start. Frank's pages have a data sheet.

Tubes4e4 · 2nd September 2007, 11:45 AM

Hi EC8010,

sorry to say so, but it is very different (1/2 the rp, double the gm, etc), and actually no member of the ECC88/6DJ8 family at all.

Quite some people have been mislead by an inconsistency in what they think to be a "quality designation/numbering scheme" for the ECC88 family of tubes: ECC88 (std), E88CC (SQ), E188CC (even better) and then ... E288CC: different tube (as is ECC808).

Actually, there is not even such a "quality" designation scheme up to and including E188CC per se, but it all was a pure marketing thing.

In the end, to stop this confusion, Philips group (mostly Valvo) introduced a print color scheme for the ECC88 family.

Tom

EC8010 · 2nd September 2007, 03:58 PM

Hmmm. Remind me not to post early in the morning. Your point is taken.

Bob, W7ETA · 3rd September 2007, 09:39 AM

If your friend wants to use it in a circuit designed for current production tubes, like the E88CC, then he should test it as an E88CC. Note the heater current is higher for the E288CC--same for ECC88, PCC88, and E188CC, higher than E88CC.
Best Wishes
Bob

Bandersnatch · 3rd September 2007, 01:35 PM

hey-Hey!!!,
The tester measures gm at some operating point. You'll want to do something like this for the 288. Look at what is set out for the 6DJ8 to develop a set of test conditions for the 288. You'll want to see proportional shift in its gm numbers.
cheers,
Douglas

jlsem · 3rd September 2007, 04:19 PM

I think that I'll suggest that he set the tester up to test E88CC and then use the next higher GM range setting and give results as actual GM figure indicated. Thanks for all of your help.

John

2nd September 2007, 02:25 AM	#1
jlsem diyAudio Member Join Date: Jun 2003 Location: Dallas,TX	Testing an E288CC (8223) Does anyone have tube tester parameters for this tube? A friend of mine has a bunch that he wants to test. He has a Hickock 539 and a military TV-10. I have a TV-7 and a Hickock 123 Card-Matic. John

2nd September 2007, 08:03 AM	#2
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	Well, the pin-out is the same as an E88CC, mu and gm are pretty similar but it's a bit beefier, so testing as an E88CC would be a start. Frank's pages have a data sheet. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

2nd September 2007, 03:58 PM	#4
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	Hmmm. Remind me not to post early in the morning. Your point is taken. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

3rd September 2007, 09:39 AM	#5
Bob, W7ETA diyAudio Member Join Date: Sep 2007	If your friend wants to use it in a circuit designed for current production tubes, like the E88CC, then he should test it as an E88CC. Note the heater current is higher for the E288CC--same for ECC88, PCC88, and E188CC, higher than E88CC. Best Wishes Bob __________________ Still a novice with electronics.

3rd September 2007, 01:35 PM	#6
Bandersnatch diyAudio Member Join Date: Jul 2003 Location: Ann Arbor, MI	hey-Hey!!!, The tester measures gm at some operating point. You'll want to do something like this for the 288. Look at what is set out for the 6DJ8 to develop a set of test conditions for the 288. You'll want to see proportional shift in its gm numbers. cheers, Douglas __________________ the Tnuctipun will return

3rd September 2007, 04:19 PM	#7
jlsem diyAudio Member Join Date: Jun 2003 Location: Dallas,TX	I think that I'll suggest that he set the tester up to test E88CC and then use the next higher GM range setting and give results as actual GM figure indicated. Thanks for all of your help. John

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