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On Sat, 12/8/18, Sergey Kubushyn <ksi@...> wrote:

Subject: Re: [TekScopes] Russian Tunnel Diodes
To: [email protected]
Date: Saturday, December 8, 2018, 12:47 PM

On Sat, 8 Dec 2018, Yiu On Tony C
via Groups.Io wrote:

GI308D
:) Mil spec variant is called 1I308D i.e. having number 1
instead of
letter G for Germanium. That is
true for all semiconductors made in former
USSR. In cyrillic it is called ГИ308Д or
1И308Д. GI308zH (ГИ308Ж in
cyrillic) is
even faster having 20mA peak current instead of 10mA for
GI308D
with almost same capacitance 1..4pF
vs 0.8..2pF for GI308D. And finally
there is
GI308K with 50mA peak current having 2.3..8pF capacitance
that is
similar to those used in Tektronix
S-52.

For the pulser built
from 067-0681-01 schematic the proper part is GI308D
that is actually much better than original
Tektronix 152-0177-02 tunnel
diode.

> Hi :
>
> I cannot find such
item on ebay ? What is the diode number ?
>
> Thanks for your
help
>
> Regard
> Tony Cheung
> DEC 8
2018
>
--------------------------------------------
> On Sat, 12/8/18, Jack Reynolds <jackandladyreynolds@...>
wrote:
>
> Subject:
[TekScopes] Russian Tunnel Diodes
> To:
[email protected]
> Date: Saturday, December 8, 2018, 4:39
AM
>
> Back in 2013
Sergey Kubushyn posted a great
>
explanation of how to build a clone of a Tektronix
067-0681
> TD Pulser.? It required a
specific Russian surplus
> tunnel
diode.? While there are always a bunch of
> Russian tunnel diodes on eBay, the
specific one he specified
> has been
impossible for me to find.? However, some just
> appeared on eBay.? There is one group of
10 pcs still
> available and they are
quite pricey compared to the other
> ones
for sale at $80 USD for 10 pieces.? The prices of
> the available pulsers make this look
reasonable.?
> However if there is
anyone else as desperate as I have been
>
to find some they are eBay item no. 323585650249.? I
> hope this helps someone.
> Jack Reynolds

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