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Old 22nd January 2007, 11:25 AM   #1
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Default Are these tubes are the same?

Hi all,


I need some help for some of you tube experts!

Could someone here have a look at these 2 data sheets and tell me if the 6P1 tube is an equivalent of the EL84?

EL84

6P1

I know the 6P1 is on chinese but you can still make out the internal connections and ratings.

If they are not the same then does anyone have any idea of an equivalent tube to the 6P1 or an easy rewire to allow another tube to be used in its place?


thanks in advance,
Fran
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Old 22nd January 2007, 01:17 PM   #2
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OK, Done some research and it appears that they are NOT the same/equivalent.


To make matters worse, the 6P1 (often seen in ebay tube amps) is usually advertised as 6AQ5. The problem is that the 6P1 is 9 pin while the 6AQ5/EL90 is 7 pin! It does seem that the 6P1 is the same as a russian 6P1P.

It really doesn't help matters that sellers of the 6P1P tube on ebay almost universally advertise it as 6P1P/6AQ5/EL90!!!!

I gather that electrically they are very similar, so could anyone shed any light on this? Is there such a thing as a 9 pin to 7 pin adapter that would allow one to use the EL90?

Fran
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Old 22nd January 2007, 03:10 PM   #3
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Unfortunate, but I have seen these mixed up for years... electrically close, but physically different. But if you have an amp that uses 6P1s, they're cheap enough, likewise so are 6AQ5s. EL84s have higher gain and will require reduction of the bias voltage or cathode resistor if you rewire sockets for them. 6973, 6CZ5, 6CM6, 6061, 6BW6 will work in place of 6P1 without circuit changes, but are different 9-pin pinouts.
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Old 22nd January 2007, 06:42 PM   #4
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Many thanks.....



So if I was going to buy some 6P1 tubes off ebay, is it good enough to check whether it has 9 pins (as opposed to 7 for the EL90)?

eg: here is an ebay auciton for 6AQ5


Note the 7 pins.

Here is one for what I think might really be 6P1

as far as I can make out theres 9 pins there.


Fran
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Old 22nd January 2007, 08:02 PM   #5
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That's the Russian tube - I believe the Chinese one is the same - looks like the base diagram in the listing. If you want 6P1s, that's what they are.
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Old 22nd January 2007, 08:22 PM   #6
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Russian 6P1P is a miniature equivalent of 6V6
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Old 22nd January 2007, 10:42 PM   #7
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except that the 6V6 is octal while the 6P1P is nine-pin.


I just have to say thanks to all you guys for the help here! (keep it coming!)


Fran
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