[Tube747]

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?

http://www.ys-audio.com/tango.htm#Input%20Transfomer

Thanks!

[Andre Jute[_2_]]

On Apr 20, 12:42*pm, Tube747 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?

http://www.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:
http://members.lycos.co.uk/fiultra/JUTE%20ON%20AMPS.htm
and in particular the circuit of The KISS Amp:
http://members.lycos.co.uk/fiultra/T...trafi-crct.jpg
and the full description of the thinking behind it at:
http://members.lycos.co.uk/fiultra/T...mp%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.