What valves are pin compatible with ECC88 / 6DJ8?

[Merlinb]

Hi,
I want to draw up a list of valves which are pin compatible with the ECC88 / 6DJ8 type base configuration.

I know of the ECC85, 6N1P, 6N2P, but what else?

I'm not worried about functional compatibility, or different heater current requirements, I'm just looking for the same pin-configuration.

 

[Ty_Bower]

The 6DJ8 has the 9AJ pinout. Go get yourself a copy of Duncan's TDSL personal edition. Use the search tool to find all the tubes with the same pinout. There's too many to list here.

http://www.duncanamps.com/tdslpe/

 

[deepthrob]

6FQ7
6922 - the Sovtec's aren't bad.

I've never heard a 6DJ8 that sounds good to my ear and I've tried a lot of them

Frank
http://newmex.com/f10/

 

[Merlinb]

The 6DJ8 has the 9AJ pinout. Go get yourself a copy of Duncan's TDSL personal edition. Use the search tool to find all the tubes with the same pinout. There's too many to list here.

http://www.duncanamps.com/tdslpe/

Aha! I've not used the personal edition, thanks for the tip!

 

[Tom Bavis]

6BQ7, 6BK7, various other similar numbers like 6BC8, 6BZ7, 6BS8. Also 6AQ8, 6DT8, 6CG7, 6GU7, etc.

 

[Rodango]

And let's not forget the best, IMHO, the 7308. and the best 7308, IMHO, the gold-pinned Amperex PQ or USN. I have a pair of USNs which are beyond incredible.

 

[casouza]

7dj8 AKA PCC88 is pin compatible and functionally compatible, except for the heater voltage.
6n23p/6H23, 6n1, 6N11, CCa, CV5358 and Ecc189 / Pcc189 also come to mind, though the last two are remote cutoff tubes.
Have fun!

 

[keshaandrea]

Hi, I bought this Zaerix CCA-E88CC gold pin.
Can anybody help me to identify the manufacture of this tube?

Thank in Advance,
Kesha

An externally hosted image should be here but it was not working when we last tested it.

 

[DF96]

If its Zaerix its probably Russian or East European. Give us a picture of the pins, getter and anodes.

 

[Positron]

6FQ7
6922 - the Sovtec's aren't bad.

I've never heard a 6DJ8 that sounds good to my ear and I've tried a lot of them

Frank
http://newmex.com/f10/

The design and parts makes all the difference. Also, the rest of the system design makes a difference.

Cheers.

 

[316a]

6/30L2 ?

 

[DF96]

Also known as ECC804. Possibly sometimes seen marked as Mazda 6CG7?

 

[Marra]

Showing my ignorance here but pin compatable means they can be used in place of without any circuit alteration?

 

[nazaroo]

Showing my ignorance here but pin compatable means they can be used in place of without any circuit alteration?

He seems to be willing to tolerate heater voltage variations (although I doubt there are any...)

"I'm not worried about functional compatibility, or different heater current requirements, I'm just looking for the same pin-configuration."

This presumably means he wants to hardwire the signal-circuit, but he may have a heater-supply with a switch,
that allows for 12.6 volt / 6.3 volt operation without rewiring the sockets.

He has effectively created his own definition of "same pin-configuration",
since he is allowing some (unspecified) differences.



I doubt there is such a pair of tubes that would allow such a wiring arrangement.

The other thing he may be missing is this:
In a low-signal preamp circuit, there is a special shield between triode sections in some tubes,
whereas in the other tubes this is just a 'ground',
or used as an extra connection to the heaters for 6.3/12.6 volt operation.

However, in low-signal applications, 12.6 volt operation is not desirable,
because these low-noise tubes have heater windings designed to cancel hum via parallel operation, and must be operated as 6.3 volts (parallel heater sections) to get the low-hum/noise benefits with A.C. heater supplies.

So its a mistake to think that you can just swap tubes,
even when the pinout for the two triode portions themselves are the same.

For example, here is the pinout for 6DJ8 / 6922 / 6N1P (Russian) / 6GM8:

Notice the shield connection on pin 9 at top.This is unconnected in a true 9AJ style pinout,
but is the center-connection of the heater in a plain 9A style.

For contrast, look at the 12AX7 / 12AU7 / 12AT7 style pinout below:

Interestingly, an identical electrical function style would be rather the 6N3P (8CJ style):

It also has an inter-triode shield, but a different pinout numbering.
A switch that altered the pin connections in the socket by swapping,
would allow a circuit to use either a 6N1P or a 6N3P.

 

[7N7]

Showing my ignorance here but pin compatable means they can be used in place of without any circuit alteration?

The short answer is NO

Paul

 

[DF96]

To me, 'pin compatible' means the same pinout and nothing more. This means that the valve can be considered a possible candidate for substitution, but checks on characteristics and heater requirements would need to be made.

 

[keshaandrea]

If its Zaerix its probably Russian or East European. Give us a picture of the pins, getter and anodes.

Sure DF96, here are the pics.

 

[keshaandrea]

Sorry repost the images, I shot with my DLSR Macro lens, I hope this will be more detail.
At the bottom, it has some C letter or something, very hard to see.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

 

[tinitus]

To me, 'pin compatible' means the same pinout and nothing more. This means that the valve can be considered a possible candidate for substitution, but checks on characteristics and heater requirements would need to be made.

possible nature of 'tube rolling' ?

 

[DF96]

The getter looks Russian. Both pictures of the pins are fuzzy, but it looks like they might have pointed ends which would again indicate Russian.