Comp PNP should be MPSA92 / 93
-ls-
"Tom Jobe" <tomjobe@...> wrote:
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Hi George,
Those NPN transistors are a nice find!
Thank you for the link to the datasheet.
Is there a PNP version?
I think that is what they are looking for.
tom jobe...
----- Original Message -----
From: G. K.
To: TekScopes@...
Sent: Tuesday, October 09, 2012 4:31 PM
Subject: Re: [TekScopes] Re: Bright dots at start of the trace on a
547
How about the MPSA42 and 43?
( ). Both
are high voltage and reasonable fast. Mouser has stock, and they are
cheap. - George
From: David <davidwhess@...>
To: TekScopes@...
Sent: Tuesday, October 9, 2012 3:27 PM
Subject: Re: [TekScopes] Re: Bright dots at start of the trace on a
547
The specifications I found for the 2N2207 were Vceo = 50 volts and
Vcbo = 70 volts. When the blanking signal is applied to the emitter
and the base driven by a relatively low impedance -0.6 volts, the
Vcbo
is a better match.
But even a Vcbo of 70 volts is not much greater than the -68 volts
marked on the schematic. Maybe Tektronix graded them for a higher
minimum breakdown voltage.
On Tue, 09 Oct 2012 21:31:25 -0000, "Albert"
<mailto:aodiversen%40online.nl>
wrote:
>No, for 151-063 (= 2N2207) Vceo = 70 V, but even then ...
>Albert
>
>> Hi David,
>>
>> you say "operating close to its breakdown voltage", then you are
joking.
>> V_ceo is 50 volts and in the schematics, the difference between E
and C
>> is over 67 volts !!
>> They are working "beyond the cliff" !
>>
>> Herbert
>
