Is WE310A > 45 > 300B PP possible? - diyAudio
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Old 5th June 2011, 01:39 AM   #1
VR2ZXP is offline VR2ZXP  Hong Kong
diyAudio Member
Join Date: Apr 2007
Default Is WE310A > 45 > 300B PP possible?

Hello everybody,

May I have your help?
I want to build a 300B push pull power amplifier.

WE310A > 45 single end > interstage transformer > 300B PP > Tamura F2021.

Q1) Which value of interstage transformer and the bias point are suitable? I suppose the Tamura B500X series.

Q2) Will the gain of this circuit too high?

Thank you so much!!

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Old 7th June 2011, 11:32 PM   #2
brady is offline brady  Philippines
diyAudio Member
Join Date: Mar 2005
Location: Cebu City
Hi VR. Discussing the operating point/s of a PP 300B into a specific load (the F2021) will take some time. I would suggest you take a look at the tube curve and define your operating point from there. You can later fine tune according to your speakers/ears

The total gain depends on voltages and current in all three stages. Since these are all low gain tubes, I don't think there'd be too much gain. Just distribute them across the stages well.

The 45 would have more than enough current and voltage to swing the 300B. cheers
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