Question about building 300B XLS SE amp

Question about building 300B XLS SE amp

Dear all,
After reading all you guys' postings, I decide not go for the 300B
push pull with multi output valves! I'm rather go for a much simple
approach -- SE amplifier with 300B XLS output tube.

This is actually my friend's suggestion.

I want to use a WE 437A driver tube and then transformer coupled to
the Emission labs 300B XLS with parafeed output arrangement (the
parafeed OPT has 5K primary).

Power supply is convention LC + CLC with 274B rectifier tube.

My question is:
What is the recommend primary impedance of the interstage transformer
for 437A? Can I use the Tango NC20F? Any comments?

* w w w .ys-audio . com /tango.htm#Input%20Transfomer

Thanks!

Re: Question about building 300B XLS SE amp

On Apr 20, 12:42 pm, Tube747 <Tube...@lycos . com > wrote:
> Dear all,
> After reading all you guys' postings, I decide not go for the 300B
> push pull with multi output valves! I'm rather go for a much simple
> approach -- SE amplifier with 300B XLS output tube.
>
> This is actually my friend's suggestion.
>
> I want to use a WE 437A driver tube and then transformer coupled to
> the Emission labs 300B XLS with parafeed output arrangement (the
> parafeed OPT has 5K primary).
>
> Power supply is convention LC + CLC with 274B rectifier tube.
>
> My question is:
> What is the recommend primary impedance of the interstage transformer
> for 437A? Can I use the Tango NC20F? Any comments?
>
> * w w w .ys-audio . com /tango.htm#Input%20Transfomer
>
> Thanks!

You're still throwing money at problems that don't exist. Even the
437A's little brother, the 417A, can be RC coupled to the 300B without
any problems. It is mainly a matter of current to overcome Miller
capacitance. See:
* members.lycos.co.uk/fiultra/JUTE%20ON%20AMPS.htm
and in particular the circuit of The KISS Amp:
* members.lycos.co.uk/fiultra/T39-KISS-300B-Ultrafi-crct.jpg
and the full description of the thinking behind it at:
* members.lycos.co.uk/fiultra/The%20KISS%20Amp%20INDEX.htm

Which speakers will you use with the 300B amp? Seriously, until you've
decided on the speakers, you cannot even begin to choose a tube.

HTH.

Andre Jute
Our legislators managed to criminalize fox-hunting and smoking; when
will they get off their collective fat backside and criminalize
negative feedback? It is clearly consumed only by thickoes.