[Premium-Rx] 6HS6'es

[Al Klase]

Hello David,

At 1/10 the price, I think the 6AH6 ( a.k.a. 6475) is a good 
alternative. Any performance differences caused by a 5% shortfall in 
transconductance is going to be extremely subtle.

I'd use the 6HS6 as V2, the mixer, the one directly in the signal path, 
and the substitute as V8, the pre-mixer.

Al

Al Klase – N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/

On 11/5/2015 3:35 AM, David Schofield wrote:
> Hi All,
>
> Not exactly premium Rx this one, but I think you are still some of the 
> best guys to ask.
>
> I'm looking for a source, preferably UK, of 6hs6 valves (tubes to the 
> US contingent...) for an R4B that I've just acquired.
>
> Their are none on Ebay UK, and no UK valve supplier has stock.
> I can buy them on Ebay in the US, but shipping is coming in at twice 
> the price of the device :-(
>
> Their seems to be some debate as to whether the 6ah6 is a suitable 
> alternative, looking at the data it seems possible, but it's Gm is 500 
> microculombs lower.
> I've ordered some of these to try, as they are readily available "dirt 
> cheap" in the UK.
> Has anyone had any experience in using 6ah6'es in location V2 or V8 of 
> the R4B. Only one of the 6hs6'es is dead, so I can fit a 6ah6 in 
> either location, or fit 6ah6'es in both locations if this is 
> considered better.
>
> I'm not a valve (tune) expert, having only touched on the thermionic 
> era at college, and some of our "old dears" still had valve TV's when 
> I started in the TV trade, but I generally left their repairs to the 
> senior workshop guy who knew them backwards (the TV's not the old 
> dears...), so any hints would be much appreciated.
>
> Cheers,
> Dave.S.
>
>
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