[Test-Equipment] Need transistor for HP 11710B

[Bill Abate]

David, Ed and Ron,

Thank you for your suggestions.  I will try the subs and see 
what works.  At least the down converter is working now.

Thanks again,

Bill, K3PGB


David DiGiacomo wrote:
> On Fri, Nov 23, 2012 at 10:58 AM, Bill Abate <wabate at verizon.net> wrote:
> 
>>I need a replacement transistor for the A1 converter amplifier board for
>>this down converter.  It is Q1 an NPN, to18 case.  It has an in-house number
>>and the parts manual only lists it as a silicon, 360 mw.  I substituted a
>>2N2222A and it works but the output is down about 10db.  Anyone know of a
>>better sub?
> 
> 
> Q1 is listed as an 1854-0019, which crosses to a Motorola SS2188,
> which is similar to a 2N2369A.
> These are readily available, see eBay or findchips.com
> Other gold doped NPNs would probably work too.
> 
> 
>>I would try a 2N3646 next.  Then the NPN of the 2N4401 -2N4403 pair would be my next attempt.
> 
> 
> Those are too slow.
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