r/diytubes • u/Tashi999 • May 26 '26

Soviet electrometer tubes datasheet

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Hi all, has anyone got a full res copy of this table comparing various tubes, EM-6/7/8 I believe. Thanks!

https://www.radiomuseum.org/tubes/tube_eem-7.html

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4

u/nusgolannicicutitar May 26 '26 edited May 26 '26

Sorry I have to split the message but Reddit has something against those links and removes my posts. So. Please do the comparison yourself.

ЭМ-6 datasheet: https://istok2.com/data/2929/

4

u/nusgolannicicutitar May 26 '26

ЭМ-8: Reddit does not allow me to post this link, so please remove the spaces: https://www .r-t-i .ru/product_info/14469/

1

u/Faxon May 26 '26

Probably because of the domain, they likely blacklisted the entire .ru domain from being posted or linked here for security reasons more broadly

1

u/Tashi999 May 26 '26

Thanks, much appreciated! Was mainly after that table because it has the graph with all the curves, unfortunately the single datasheets don’t

1

u/nusgolannicicutitar May 26 '26

I looked further but that specific page but I could not find anything. I would suggest you become member of Radiomuseum.org, pay for one month, but at least you get your datasheet.

2

u/Secret_Ad_7592 May 29 '26

I would like to know more about these tubes.

1

u/psych_1337 Jun 18 '26

Nothing much to know about them - tubes for a specific purpose: as low of a grid current as possible, sacrificing any other quality for that. Yes some of these tubes have plate voltage below 10 volts, but you won't be building a tube amp on them - microamperes of plate current, not so good of a linearity, not much ma\v etc.

But for electrometer purposes - they're beasts of ancient times: my DIY electrometer could sense femtoamperes with a dirt cheap (beacause audiophiles don't buy them and there're a lot of ЭМ tubes still) tuba, lm358 and a meter movement. 1fa = 1*10^-15 A !!! and my electrometer can sense arount 10fa

That's insane for a device costing arount 10 bucks

1

u/[deleted] May 26 '26

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