• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

1SH24B Pre-Amp (or buffer?)

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
Jump to Latest
N

NebuK

Member
Joined 2011
Hey,

i've more or less randomly got a set of 1SH24B sub-miniature battery-voltage tubes. Now beeing not a tube guy myself i've searched the interwebs for what could be done with them. All i've found is this:
http://pics.kanojo.de/Preamp1sh24.gif
schematic without any further notes. Not beeing able to intuitively "read" tube schematics i'm a bit at loss here. I'd just try the schematic, its not very costly. I'd try this:
http://pics.kanojo.de/1sh24b-eagle.png

However, i thought i might just as well ask around if anyone here already used this tube in a preamp or buffer with success ... or knows some place where i can obtain a (better?) schematic with a proper description...

Thanks in advance, regards
- NebuK
 
V

v4lve lover

Member
Joined 2010
easy DC heated tubes whit a 47u cap directly near the tube to keep the voltage stable and hum free .

first tube is in pentode mode whit G2 drive followed by a 2n2904 buffer and a tone stack feeding the second tube .

second tube is also buffered by a transistor .

have a good one .

just breadboard the scematic and see if you like it standart parts can be used as its low voltage
 
Last edited:
N

NebuK

Member
Joined 2011
Hey,

sorry for the late reply and thanks for your quick answer.

I planned to leave the tone-stack out as i don't need it. Could you describe what the second tube is for? As its identical to the first tube+aux-parts in the schematic i suspected those act as input- and output buffers to the filters in the middle... If that'd be the case i could just leave out the second tube too. I want to use it as a single buffer/preamp after all...

Thank you once again. I'll be soon able to order the parts for breadboarding ;P.

Regards
- NebuK
 
M

mwiebe

Member
Joined 2004
If you have the 1SH24Bs and are just noodling around for schematic ideas, remember those 1Ж24Б tubes are called a variety of things outside Russia, also google for 1Zh24B and 1J24B.

For a P-P preamp and other types see,
Sputnik - 9V Superheterodyne tube radio

There are quite a few projects built with those and the similar small pentode 1Ж17Б and 1Ж18Б. And there are also plenty of small triodes to work with that may be easier to implement but no Russian subminiatures that are easily found are direct heated triodes.
Matt
 
N

NebuK

Member
Joined 2011
Hey,

thanks again. I've been looking for the other names for this tube as you suggested - i didn't know!

I've stubmled upon the YAHA amplifier, which seems to have been done with the 1sh24b already (although all i can find is some forum-post about "done it, works, is nice", no schematic ;/). The general idea is here:
The YAHA amp

Now ... i'm really wondering whether this schematic could be adopted to fit the 1SH24B... I've started reading a big fat army manual about tubes recommended by a tube-radio enthusiast ... will take me a while ;P. But maybe i can adopt it after i understood what the f... really happens in those small glass thingies ;).

Regards n thanks
-NebuK
 
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
Top Bottom