[time-nuts] Looking for Harris/Qbit amplifers

Bruce Griffiths bruce.griffiths at xtra.co.nz
Tue Jan 24 14:17:01 EST 2012


ed breya wrote:
> Yes, those are handy amplifier modules - I always save any that I find 
> in surplus RF gear. You can easily replicate the functions with modern 
> gain blocks, or your own circuit using discrete parts, if you don't 
> need the "drop-in" hermetic package style.
>
> The ones with about 10 dB gain are single stage shunt feedback 
> amplifiers. Besides simplicity, the big advantage of store-bought ones 
> is that they are exactly specified, while home-made ones are not, so 
> it depends on the application.
>
> The larger TO-8 cans usually have built-in coupling caps, while the 
> TO-5 types often do not. Quite a few manufacturers got into the VHF 
> amplifier module business through the 70s and 80s, but I don't know 
> who is still left making those old hermetic can styles. There are lots 
> of makers and models of newer types in plastic packages
>
> Here are some that used to make hermetic styles - they all had more or 
> less equivalent models available:
>
> Amplifonix
> Anzac
> Avantek
> Motorola (TO-5 MWA series only)
> NEC
> Qbit (merged w/ Amplifonix?)
> Teledyne
> Watkins-Johnson
>
> I would look at Minicircuit Labs for modern amplifier blocks, maybe 
> including hermetic - but those will be spendy brand new, regardless of 
> the source.
>
> Ed
>
Spectrum microwave <http://www.spectrummicrowave.com> inherited 
<http://www.spectrummicrowave.com> the Qbit line.

Bruce




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