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-   -   8608 pentode (http://www.diyaudio.com/forums/tubes-valves/151432-8608-pentode.html)

nhuwar 10th September 2009 06:34 PM

8608 pentode
 
Hi all,


Just wondered if anyone has heard of this tube being used in audio applications ?
Any opinions of how the tube performed will be greatly appreciated?

I have 4 old amprex gold pin 8608 and I'm trying to think of something to do with them.
Thanks,
Nick

Bandersnatch 10th September 2009 07:07 PM

hey-Hey!!!,
With a significant part of the g1 plate curves above its plate dissipation, I'd want to run it at lower g2 voltages. beyond that, it looks like a fine audio tube. If you've got a linestage with balanced output a *VERY* simple amp can be built with just a two-tube, PP power stage. Looks like an easy 6-8W to mee...:) wishing I had several of them myself.
cheers,
Douglas

nhuwar 10th September 2009 07:32 PM

:Well I was thinking about using it as a driver for a 813.


I know it's probably a bit over the top but I think it would look cool to have a ll the tube have plate caps.


Oh and ya my linestage does have balanced outputs too LOL, how'd you know :D
Nick

RE 604 10th September 2009 10:04 PM

The 8608 is an E55L / 8233 with plate caps .

http://www.diyaudio.com/forums/tubes-valves/25479-e55l-triode-driver.html

Regards , Alexander .

nhuwar 10th September 2009 11:07 PM

Does anyone have a load line draw up for either of these tubes?



Thanks,
Nick

Bandersnatch 10th September 2009 11:07 PM

Quote:

Originally Posted by nhuwar (Post 1920739)
:Well I was thinking about using it as a driver for a 813.


I know it's probably a bit over the top but I think it would look cool to have a ll the tube have plate caps.


Oh and ya my linestage does have balanced outputs too LOL, how'd you know :D
Nick

hey-Hey!!!,
813 driver sounds cool...:) I am driving mine with a 6H6Pi/FQP1N60 cascode. Let me suggest for you E-Linear at 20-25%, B+ of ~600 to plate and screen( the 813's ), and an 8k a-a load. 8608 g2 around 75V, with plate loads of 15-20k and idle current 15-20 mA per.

Or you could build a 'scope and use them for horizontal outputs.
cheers,
Douglas

nhuwar 10th September 2009 11:15 PM

I was going for 1kv on the plate of the 813 and running 6500 ohm plate load.

The idea has been in the works for a while it's just changing the driver tube is something new.




Oh this is a se amp though, not a push pull. I was toying with that idea a while back just didn't have the room LOL.


Nick

Wavebourn 10th September 2009 11:37 PM

A nice tube for a 1-tube hybrid amp!
I would use it triode strapped, gyrator loaded, to drive MOSFET source follower.

nhuwar 11th September 2009 12:46 AM

Gyrator loaded, I've never heard of that one. But then again there's a lot in this obsession I haven't learned yet.

Wavebourn 11th September 2009 02:34 AM

Quote:

Originally Posted by nhuwar (Post 1920931)
Gyrator loaded, I've never heard of that one. But then again there's a lot in this obsession I haven't learned yet.

Here is the basic version that I used several years ago in a mic pre:

http://wavebourn.com/images/audio/CS...-Wavebourn.gif

Here is another version Hearinspace implemented in his high-end amp:

http://wavebourn.com/forum/download.php?id=125&f=7


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