Seduction And Reduction Tube Equivalents

[Grainger49]

This thread is getting started to explore tube types, different numbers, that can be used in the Seduction (and now Reduction) without any circuit modifications.  That is, drop in equivalents.

These are the ones I have found.  I will modify the OP with others as posters contribute other numbers.

If anyone finds that I have a tube with the wrong pin out, or higher heater current than the Seduction can supply please post and I will modify the OP accordingly.

Seduction Tube Equivalents (in numerical order):

6DJ8
6DJ8 (just the generic, many below are better spec tubes)
6N23P (P9 is shield) -EV are tighter specs
CV2492
CV2493
CV4108
CV4109
CV4110
CV5231
CV5354
CV5358
ECC88
E188C
E188CC
E288CC ?
E88CC
6922
7308

Edit: Three dropped.

[coca]

6H23 will work with no changes.

Bernie.

[JC]

Just to be clear, you are referring to the Russian tube, correct?

[Grainger49]

Jim,

Yes, the H is a Cyrillic N.  And the P at the end is actually Pi, which doesn't appear on my keyboard.

[JC]

Which explains why one may see them listed as 6N23, 6H23N, 6H23n, and sometimes with a "-EB" suffix.

As if the West didn't have enough numbering systems of its own for tubes!  Lord knows what the Chinese system looks like...

[Grainger49]

Yes, the Pi really looks like an N, the N is an H and they use B instead of V for volts.  I'm guessing that there is no V in the Cyrillic alphabet.  

The -EB suffix often denotes the higher tolerance tubes, a select tube.  I just ordered 4 from RU Tubes in Moscow.

[notben]

I read some posts on the old asylum board from a few years back regarding some of the tubes on this list, specifically the CV2493 and the CV5358: http://tinyurl.com/25g7ano
I just received my Seduction kit and want to know if there has there been a change to the PT-1 or if the old list I linked to is still in question. Or, if for those specific tubes it is a matter of type 1 versus type 2, etc.
Thanks.

[Grainger49]

Yes, all those are within the range of the PT-1.  The PT-1 can supply rectified and filtered 365 mA per tube.  The design is for 365mA per tube.  Everything on the list is 365mA or less. The two you mention are direct drop in replacements for the 6DJ8 (same heater current). The Seduction manual lists the supplied tubes as 6DJ8/6922.

If you want to use type 2, 3 or 4 tubes the series resistor in the heater supply could be adjusted to bring any of the other types back to exactly the design voltage.  I don't think that the 6DJ8 was run at a full 6.3V.  (5.7-6.3V according to PJ in Reply #12 below.)

[notben]

Very good. Thanks!

[jamestw]

Hi Grainger,
How's about this NOS VALVO AMPEREX PCC88 (7DJ8) tube selling at eBay now :
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=250361475103#ht_8010wt_1135

In descriptions: ......Real PCC88 are drop in replacements for ECC88/6DJ8/E88CC with a slightly higher heater specification of 7 volts producing a much longer life and lower noise threshold when used in place of ECC88/6DJ8.

I'm still looking for a pair of spare tubes for my Secduction, Don't know if this kind PCC88 tubes can be directly replaced ?

Thanks,
james

[Grainger49]

Yes, they look similar.  But it is a 7.6V heater.  The 6DJ8 variants are 6.3V.  There will be a change in the tube's sound with more than a volt low on the heaters.

[jamestw]

Thanks, Grainger.

james

[Paul Joppa]

Seduction runs the heaters at 5.7 to 6.0 volts, which gives the "longer life and lower noise" effect. Running a 7DJ8 that low will give very long life and no noise at all - but no sound either of course; the heaters will be too cold to function!

[jamestw]

OK. now I understanded, Thank you, Paul.
:-)
james

[8452]

How about the 6ES8? I inherited 30 Bugle Boys so I hope its OK to use them. I visited several on-line tube substitution guides and this tube is listed as a 6DJ8 sub.