6CM5 / EL36 Guitar amp.

juanro · Post by **juanro** » 02 Nov 2011, 02:46

Hi,

I came into posession of an old, australian? "Philips" amp. I think it's an audio/PA amplifier.
Two 12AT7 in the pre (but one of them should be a 12AX7, according to the little piece of paper attached to the OT), and two EL36 PP output, fixed bias in penthode mode (VG2 = 150v).
I'm planning to totally ditch the pre, setup some very basic Gain / Tone / Volumen, use the output section more or less as it is, and rehouse it.
I couldn't found much info on this tube (the 6CM5 / EL36), but for some multi-tube (4 ) PA's.
Any info on a guitar amp using this (or simmilar) tube would be very welcome. I'll post pictures and the schematic of the output stage as soon as I can get my hands dirty (and looking at what I got, they will)

Regards,
Juanro

RnFR · Post by **RnFR** » 02 Nov 2011, 08:59

sounds interesting, I love pa amps. how many watts?

deltafred · Post by **deltafred** » 02 Nov 2011, 09:13

Here is the Mullard datasheet for the EL36

RnFR · Post by **RnFR** » 02 Nov 2011, 09:25

looks like 14.5w.

juanro · Post by **juanro** » 02 Nov 2011, 10:55

I love obsolete devices!

14.5w for a couple in push-pull in self bias.
But the examples I've seen quote around 30 / 40w for two in PP with fixed bias. (In full class B, not AB)

The amplifier I got is 40w.

Juanro

DrNomis · Post by **DrNomis** » 02 Nov 2011, 10:56

You could probably make a nice little Blues combo amp with the chassis, check out the AX84.com website for amp projects and schematics....

juanro · Post by **juanro** » 02 Nov 2011, 12:29

Hi,

DrNomis, the chassis is awfull... that's why I'm thinking in rehousing.
This is what I'm planning to use, for a neat retro-mini-header look:

: s_MLA_v_O_f_67968616_8456.jpg (23.31 KiB) Viewed 1155 times

(It is an old voltage regulator)

Here there are some of the links I've found so far:

http://www.turneraudio.com.au/2323-trio ... d-6cm5.htm

http://home.alphalink.com.au/~cambie/EL36.htm

And this schematic is pretty much like the one I have:

(Actual model number of mine is EV2401)

Juanro

DrNomis · Post by **DrNomis** » 02 Nov 2011, 14:46

juanro wrote:Hi,

DrNomis, the chassis is awfull... that's why I'm thinking in rehousing.
This is what I'm planning to use, for a neat retro-mini-header look:
s_MLA_v_O_f_67968616_8456.jpg
(It is an old voltage regulator)

Here there are some of the links I've found so far:

http://www.turneraudio.com.au/2323-trio ... d-6cm5.htm

http://home.alphalink.com.au/~cambie/EL36.htm

And this schematic is pretty much like the one I have:
EV4435_JohnHunter.gif
(Actual model number of mine is EV2401)

Juanro

Very cool, I love the retro look of the housing you're planning on using, it'll look even more retro if you use black pointer ("Chicken-Head") style knobs, but you might want to use other style knobs, looking forward to seeing a pic of the finished amp...

I checked out the schematic you posted, I'm not sure if you're going to wire up the parts as per the schematic, or maybe re-design it, but it looks like you should be able to get some nice clean tones out of it....cheers for posting the pic, schematic, and links.....