Happy New Year!! I have unusual tubes...

[PositiveNegativeMan]

HAPPY NEW YEAR Amp buddies!!!

Well there I was, just browsing and there was a box of 20 ECL80 valves for £2. So I bought them. Just an impulse buy.
Now I'm thinking it would be nice to actually design something that will work with them but they aren't very common.
I had no joy finding a datasheet, google threw me a couple of links but they wouldn't display properly (ok, maybe that might be my browser).
I would love to know if anybody here has knowledge and / or experience with these at all. Has anybody managed a decent result using these as preamp tubes? Does anyone have a datasheet for them that they wouldn't mind sharing?

[big_teee]

Happy New Year to all!
We are going to eat black eyed peas and Collard greens for supper!
Maybe that will jump start my 2016 Financial Year!

[g1]

Happy New Year!

Try this:
http://www.r-type.org/pdfs/ecl80.pdf

[Enzo]

Odd, my peas have no black eyes or any other injury. Stop abusing your peas, man.

[PositiveNegativeMan]

Happy New Year!

Try this:
http://www.r-type.org/pdfs/ecl80.pdf

Nice! Thank you!!

[Jazz P Bass]

Here is a link to a low power amp using the ECL80 triode/ pentode in the output section..

Low Power Vacuum Tube Guitar Amplifier

[überfuzz]

Happy new year!

I also have an unusual tube, filled with liquid fuel, labelled something Black Label ... Scotch something. So far I only found one use for it.

[J M Fahey]

Those ECF80 loook interesting, I would also have bought a containerfullat such a price.

Now to the practical side:
* the pentode is rated for an 1.7W RMS amplifier, excellent for a play at home amp.
Now the problem is that they require 11k plate load, not very a common OT, *but* I think of a parallel tubes single ended stage and now it becomes very reasonable 3.5W RMS, 5500 ohms plate load amplifier, a way easier to find transformer.

Who cares about the "wasteful" output stage given the price?

As of the triode, gain is very low 10X, but even so I can easily imagine this:
Jack > triode stage 1 > A500k volume control (might also add a simple 1 pot tone control) > triode stage 2 > parallel pemtodes > 5k OT > guitar speaker

You may make a very good amp for peanuts ... in fact 10 of them

IF I had , say, 100 or 200 of them, I'd custom design and commercially sell such an amp, go figure.

[Justin Thomas]

I'm being somewhat sarcastic here, but...

What's the difference in using 4 low-gain triodes strung together? I mean, all those 13 cascaded 12AX7 stages in all those Uber-Gain amps, then all that gain dumped to ground anyway? And all those 27 knobs, buttons, and switches? Don't talk to me about waste and inefficiency! I'd rather waste electricity than all that luscious gain! I mean, that's just more distortion, right?

Down with 12ax7s and in with the 12AU7-based 5150!

Justin

[Justin Thomas]

Happy new year!

I also have an unusual tube, filled with liquid fuel, labelled something Black Label ... Scotch something. So far I only found one use for it.

Decreasing engines and stovetops?

Justin

[Leo_Gnardo]

I also have an unusual tube, filled with liquid fuel, labelled something Black Label ... Scotch something. So far I only found one use for it.

That's the tube that will make you glow inside. Good way to start a new year.

[eschertron]

Happy new year!

I also have an unusual tube, filled with liquid fuel, labelled something Black Label ... Scotch something. So far I only found one use for it.

I have several unusual tubes, imported from San Diego County, that I'm using tonight. So far, three of them have outgassed. If I thought they'd still be valuable in 20 or 30 years, I might be concerned.. but no, I'm not feeling too concerned just now

Have a happy and prosperous new year, all!

[PositiveNegativeMan]

Here is a link to a low power amp using the ECL80 triode/ pentode in the output section..

Low Power Vacuum Tube Guitar Amplifier

Groovy!! Thank you! I googled for ECL80 amplifier and got nothing as useful as this! Did you aready have this or do you use a different search engine?

[PositiveNegativeMan]

Those ECF80 loook interesting, I would also have bought a containerfullat such a price.

Now to the practical side:
* the pentode is rated for an 1.7W RMS amplifier, excellent for a play at home amp.
Now the problem is that they require 11k plate load, not very a common OT, *but* I think of a parallel tubes single ended stage and now it becomes very reasonable 3.5W RMS, 5500 ohms plate load amplifier, a way easier to find transformer.

Who cares about the "wasteful" output stage given the price?

As of the triode, gain is very low 10X, but even so I can easily imagine this:
Jack > triode stage 1 > A500k volume control (might also add a simple 1 pot tone control) > triode stage 2 > parallel pemtodes > 5k OT > guitar speaker

You may make a very good amp for peanuts ... in fact 10 of them

IF I had , say, 100 or 200 of them, I'd custom design and commercially sell such an amp, go figure.

I could not refuse them at the price, even though I didn't know they were a Triode/Pentode until *after* I got them home!! When I found out I started toying with the idea of a regularish 12ax7 pre stage and then something using them in a P-P output for a low volume amp. That was before I had that nice datasheet that g1 posted the link to. Your idea seems better though!!

[Dave H]

I didn't know they were a Triode/Pentode until *after* I got them home!!

It's all in the name.

E = 6.3V heater
C = Triode
L = Pentode

An ECL80 is therefore a Triode/Pentode with a 6.3V heater