[Hammarlund] HQ-170 Questions

[rrkrr]

DW,
The RF Amp plug-in was sold under the trade name "Nuvistaplug", although 
some people made their own.  The two 6DS4 triodes are connected in 
cascode.  This arrangement gives much better noise figure than the 
original RF Amplifier tube.  These were also used in the SP-600.
See:
http://www.hammarlund.info/download/tech-bulletin-107.zip

Bob K4ERR

DW Holtman wrote:
> Hello,
>
> Thank everyone for the information on the clock, I will get one on 
> order soon.
>
> More questions on the HQ-170.
>
> 1. Where is the Serial Number located? Maybe the one on mine was torn 
> off. How do I tell if mine is an older model 170?
>
> 2. How well does the Hammarlund Noise Immunizer work? Someone 
> installed in my receiver.
>
> 3. In place of the RF amp this receiver has a couple of 6DS4 Nuvistors 
> installed on top of a 7 pin tube type plug and plugged into the RF Amp 
> V1. Does anyone know anything about this mod?
>
> Thank you in advance for all of your help.
>
> Best,
> DW Holtman
> WB7SSN
>
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