Help identifying a tube.

leadbelly · 6th April 2007, 07:45 PM

I just found a couple of NOS tubes in my dad's junk. One is an NOS RCA 6267, made in Holland.

The other has most of the labelling worn off. It is a dual triode, noval, with a shield between the triodes. I can only make out the last 2 figures of the tube designation, P8. There are some manufacturer codes too, a smudged figgure followed by U6, and on the next line, 45B2. Help?

Johan Potgieter · 6th April 2007, 09:02 PM

Hi Leadbelly,

The 6267 appears to be the same as an EF86.

The other tube might be an ECC88 if the P could be a half-erased 8. But there are a number of similar dual triodes, not all familiar to me. If you could work out the pin connections it may help to find what it is similar to. Perhaps others can help here.

leadbelly · 7th April 2007, 12:09 AM

Thanks Johan. The pinout is typical noval dual triode: pin 4 & 5 to heater, pin 9 is shield. The "P" can't be an "8", the top left is pretty sharp, there is a chance it could be a "B", but it does look more like an intact "P". There is a chance that the last digit is a "6" and not an "8".

Tom Bavis · 7th April 2007, 12:36 AM

My vote is for ECC85, 6AQ8. Pinout is right, has a shield, Philips code is tU. Tests like 12AT7, but with 6V heater.

tubelab.com · 7th April 2007, 12:56 AM

I had come up with a similar conclusion. I t has to be a tube with the EIA base code 9AJ. These include the 6BC8, 6BS8, 6ES8, 6AQ8, 6BZ8, 6DJ8, 6DT8, 6JK8,6KN8,12DT8,17EW8, and a few others.

plates on pins 1 and 6
grids on pins 2 and 7
cathodes on pins 3 and 8

There aren't too many dual triodes that end in 6 or 8.

leadbelly · 7th April 2007, 02:56 AM

Quote:

Originally posted by Tom Bavis
My vote is for ECC85, 6AQ8. Pinout is right, has a shield, Philips code is tU. Tests like 12AT7, but with 6V heater.

I guess that's right. The 1st line might read as "tU5" and the 2nd line is the Heerlen triangle followed by "5B2". But it doesn't explain the "P" in the actual tube type which is the only thing clearly readable! It makes sense that it's a Philips tube, my uncle worked for them in the 70's and that's how I think they wound up in my dad's stuff

tubelab.com · 7th April 2007, 03:14 AM

PCC85?

6th April 2007, 07:45 PM	#1
leadbelly diyAudio Member Join Date: Dec 2002 Location: Calgary, Alberta	Help identifying a tube. I just found a couple of NOS tubes in my dad's junk. One is an NOS RCA 6267, made in Holland. The other has most of the labelling worn off. It is a dual triode, noval, with a shield between the triodes. I can only make out the last 2 figures of the tube designation, P8. There are some manufacturer codes too, a smudged figgure followed by U6, and on the next line, 45B2. Help? __________________ Aerodynamics are for people who can't build engines. Enzo Ferrari

7th April 2007, 12:09 AM	#3
leadbelly diyAudio Member Join Date: Dec 2002 Location: Calgary, Alberta	Thanks Johan. The pinout is typical noval dual triode: pin 4 & 5 to heater, pin 9 is shield. The "P" can't be an "8", the top left is pretty sharp, there is a chance it could be a "B", but it does look more like an intact "P". There is a chance that the last digit is a "6" and not an "8". __________________ Aerodynamics are for people who can't build engines. Enzo Ferrari

7th April 2007, 12:56 AM	#5
tubelab.com diyAudio Member Join Date: Jul 2005 Location: South Florida	I had come up with a similar conclusion. I t has to be a tube with the EIA base code 9AJ. These include the 6BC8, 6BS8, 6ES8, 6AQ8, 6BZ8, 6DJ8, 6DT8, 6JK8,6KN8,12DT8,17EW8, and a few others. plates on pins 1 and 6 grids on pins 2 and 7 cathodes on pins 3 and 8 There aren't too many dual triodes that end in 6 or 8. __________________ Too much power is almost enough! Turn it up till it explodes - then back up just a little.

7th April 2007, 03:14 AM	#7
tubelab.com diyAudio Member Join Date: Jul 2005 Location: South Florida	PCC85? __________________ Too much power is almost enough! Turn it up till it explodes - then back up just a little.

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6th April 2007, 09:02 PM	#2
Johan Potgieter diyAudio Member Join Date: May 2005 Location: Pretoria, South Africa	Hi Leadbelly, The 6267 appears to be the same as an EF86. The other tube might be an ECC88 if the P could be a half-erased 8. But there are a number of similar dual triodes, not all familiar to me. If you could work out the pin connections it may help to find what it is similar to. Perhaps others can help here.

7th April 2007, 12:36 AM	#4
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	My vote is for ECC85, 6AQ8. Pinout is right, has a shield, Philips code is tU. Tests like 12AT7, but with 6V heater.

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