EL2 pushpull schematic

Discussion:

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Gerhard

2004-01-26 01:34:33 UTC

Hi Guy's,
this is my first post so please be kind. I'm searching for a schematic for
two EL2 in pushpull connection. I've got a bunch of Mullard's EL32 and all i
find about that this tube wasn't very common. I figured out, that they have
exactly the same data's as the EL2. Now my questions. 1. Are they
interchangeable ? 2. Got anyone experience with these tubes ? 3. Got anyone
a schematic, i requested ?
I'm only dealing with guitar amplification. I made a few class a project's
and all work fine.

Thank's in advance. Any help will be appreciated.

Gerhard

Henry007

2004-01-26 05:50:57 UTC

Permalink

Post by Gerhard
Hi Guy's,
this is my first post so please be kind. I'm searching for a schematic for
two EL2 in pushpull connection. I've got a bunch of Mullard's EL32 and all i
find about that this tube wasn't very common. I figured out, that they have
exactly the same data's as the EL2. Now my questions. 1. Are they
interchangeable ? 2. Got anyone experience with these tubes ? 3. Got anyone
a schematic, i requested ?
I'm only dealing with guitar amplification. I made a few class a project's
and all work fine.
Thank's in advance. Any help will be appreciated.
Gerhard

Well according to the oracle (google) in PP you can get 7 watts out of a
pair... So kind of like a 6K6 or so I guess... Enough powre to be useful but
not annoy the neighbours too much. If you have lots of them, you could even
go parallel push pull with 4 of them.

You could probably just use any 6V6 or EL84 PP cathode biased schematic and
up the cathode resistors so that you don't run the tubes too hot.
(Vanode-Vcathode) x Icathode = dissipation.

Try looking at http://www.r-type.org/exhib/aaa0314.htm and clicking on some
of the links there. BTW I seriously doubt that this is the same as a VT52,
that is a power triode not a pentode.

Regardless, it would certainly make for a unique guitar amp!

Chenchen Ku

2004-01-26 07:21:11 UTC

Permalink

I've tried EL32, it uses about the same bias as 6V6, however, even
Mullard branded it sounds pretty bright to me, but of course
YMMV, so give it a try.

Chenchen

Ronald

2004-01-26 07:40:18 UTC

Permalink

Hi Gerhard ,

I think looking at the datasheet will help you :
http://www.mif.pg.gda.pl/homepages/frank/sheets/005/e/EL2.pdf

Ronald .

JKoning

2004-01-26 21:29:23 UTC

Permalink

Q1 Are they interchangeable ?
A1 Yes and no!

They are in the sense of electrical specifications.
The MK-handbook does list EL2 and EL32 as
electrical equivalent tubes.

They are not, in the sense of pin compatability,
but you must have seen this with the tubes at hand.

Tube parameters, both EL2 and EL32.
S = 2.8 mA/V (Transconductance)
Ri = 70 Kohm (Plate resistance)
Wa = 8 Wmax. (Plate dissipation)
Vf = 6.3 V
If = 0.2 A

EL2 uses the "P" base (with the "side-pins").
EL32 uses an octal base.
Pin no.'s EL2 EL32
Anode 8 3
G3 tied to cathode (both)
G2 7 4
G1 bulb top cap (both)
Cathode 4 8
Filament 2-3 2-7

Q2 Got anyone experience with these tubes ?
A2 Not me!

Q3 Got anyone a schematic, i requested ?
A3 Not a schematic, but operating parameters.

EL2/EL32 in PP, auto bias.
Va = Vg2 = 250V
Ia = 2 x 27.5mA
Ig2 = 2 x 4.5mA
Rk = (1x) 300ohm
Raa = 8Kohm
Vi = 2 x 24V
Po = 8Watt
d = 1.4%
Rg1= 1Mohm max

Rgds,
Jan.

Gerhard

2004-01-26 23:57:23 UTC

Permalink

Thanks Guy's, it brings me further

Gerhard

Post by Gerhard

Post by Gerhard
Hi Guy's,
this is my first post so please be kind. I'm searching for a schematic for
two EL2 in pushpull connection. I've got a bunch of Mullard's EL32 and

all

Post by Gerhard
i

Post by Gerhard
find about that this tube wasn't very common. I figured out, that they

have

Post by Gerhard
exactly the same data's as the EL2. Now my questions. 1. Are they
interchangeable ? 2. Got anyone experience with these tubes ? 3. Got

anyone

Post by Gerhard
a schematic, i requested ?
I'm only dealing with guitar amplification. I made a few class a project's
and all work fine.
Thank's in advance. Any help will be appreciated.
Gerhard

Q1 Are they interchangeable ?
A1 Yes and no!
They are in the sense of electrical specifications.
The MK-handbook does list EL2 and EL32 as
electrical equivalent tubes.
They are not, in the sense of pin compatability,
but you must have seen this with the tubes at hand.
Tube parameters, both EL2 and EL32.
S = 2.8 mA/V (Transconductance)
Ri = 70 Kohm (Plate resistance)
Wa = 8 Wmax. (Plate dissipation)
Vf = 6.3 V
If = 0.2 A
EL2 uses the "P" base (with the "side-pins").
EL32 uses an octal base.
Pin no.'s EL2 EL32
Anode 8 3
G3 tied to cathode (both)
G2 7 4
G1 bulb top cap (both)
Cathode 4 8
Filament 2-3 2-7
Q2 Got anyone experience with these tubes ?
A2 Not me!
Q3 Got anyone a schematic, i requested ?
A3 Not a schematic, but operating parameters.
EL2/EL32 in PP, auto bias.
Va = Vg2 = 250V
Ia = 2 x 27.5mA
Ig2 = 2 x 4.5mA
Rk = (1x) 300ohm
Raa = 8Kohm
Vi = 2 x 24V
Po = 8Watt
d = 1.4%
Rg1= 1Mohm max
Rgds,
Jan.