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837 tube for SE Amplifier

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kuka_v

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Joined 2007
#1
Have you any idea about this pentod, I mean 837 tubes.
Nothing information at all... I have tryed search here and google too.
I want to make SE amplifies based on this tube.
Can anybody help me with 837's in triod curves? May be you get me your personal opinion about triod mode for this tube.

PS Typical datasheet I already have! I ask about triod curves!
 
#2
kuka_v said:
Have you any idea about this pentod, I mean 837 tubes.
Nothing information at all... I have tryed search here and google too.
I want to make SE amplifies based on this tube.
Can anybody help me with 837's in triod curves? May be you get me your personal opinion about triod mode for this tube.

PS Typical datasheet I already have! I ask about triod curves!
Click to expand...


I would have gone for a more available valve.
Otherwise when the valve finally wears out you will have trouble getting another one.
 
#4
I would have gone for a more available valve.
Otherwise when the valve finally wears out you will have trouble getting another one.
Click to expand...

The 837 is a readily available and very inexpensive tube for what it is. As for triode curves, you'll probably just have to derive them yourself. It's possible that Tubelab has done some experimenting with them.

John
 
#6
jlsem said:


The 837 is a readily available and very inexpensive tube for what it is. As for triode curves, you'll probably just have to derive them yourself. It's possible that Tubelab has done some experimenting with them.

John
Click to expand...


If you use a 12AX7 / ECC83 then the curves are in the data sheets.

Pretty much most guitar valve amps have 12AX7's on the front end so there are bags of examples for circuits.

I used this valve on a mixer pre amp and it gives very good results. I have 3 clean channels and a high gain channel that gives great distortion for my guitar.
 
#7
hey-Hey!!!,
Why restrict yourself to running the 837 strapped as a triode? With some attention to its curves, it will work well as a pentode, or even properly proportioned Ultra-Linear( get the tap placed in the right spot, that is ).
cheers,
Douglas
 
#9
Tweeker said:
Im not sure the screen would like UL. The max rating is listed as 200V? Whether this tube can be pushed in that regard I am uncertain.
Click to expand...

One can get U-L with a CT winding to run CFB, or for that matter to energize the g2 directly. Either way, IIRC I've thought that the 837 was going to need positive grid drive in any case.
cheers,
Douglas
 
#10
.....
. tube looks really good, please report about build progress.
Click to expand...

I have derived 837's in triod curves. And would like to share it to you.
There you can find some suggetion for using in SE.
(in attach)
 

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  • 837-trio.jpg
    837-trio.jpg
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#13
Hello,
I just wired up a pair of 1940's RCA JAN with a Navy anchor on the base 837's in a SET headphone amplifier, just a start. The sound is big and full. The noteable thing is the cool bright blue glow. More, brighter, blue glow than I have seen before.
DT
All just for fun!
 
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