Please help with Stancor A-4416 - diyAudio
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Old 21st February 2004, 01:42 AM   #1
arnoldc is offline arnoldc  Philippines
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Default Please help with Stancor A-4416

hi all,

i have with me a bunch of Stancor A-4416 transformers. i was informed that i can use these as phase splitter for the push pull pentode amp i am working on. the secondary has two black wires and two green wires.

how would i know the phase of these so i can achieve the proper phasing for the output section.

any information about how to do this, or information about the transformers in question are greatly appreaciated, as usual

many thanks.
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Old 21st February 2004, 10:23 AM   #2
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Default A-4416

Hi,

According to the catalog I have the A-4416 is for P-P plates (3kohms-10kohms) to P-P grids. The ratio of primary to one half secondary is 5:1. Maximum DC in the primary is 40mA, I think probably zero unbalanced DC. It has the split secondaries so that you can individually bias the output tubes and/or use inverse feedback. Not sure how they will work for phase splitters, maybe with a parafeed primary. Given the large stepdown ratio, I might guess they were designed for A2 or B2 finals.

I am no help on phasing at the moment.

Michael
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Old 21st February 2004, 10:25 AM   #3
MIKET is offline MIKET  United States
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Default DIY

With a signal generator and scope you can figure it out quite easily.
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Old 21st February 2004, 11:19 AM   #4
arnoldc is offline arnoldc  Philippines
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hi michael,

thank you very much for the information, it looks like i would go for lundahl afterall.

oh, how else can i use these?
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Old 21st February 2004, 11:25 AM   #5
SY is offline SY  United States
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oh, how else can i use these?
I suppose that if you need large grid swing with low current (like for a cathode follower or Mac-type connection), you could turn them around. They'll reflect 5x the input capacitance of your outputs, so you may need to drive them with followers in this connection. With a CF output stage, that may not be too serious, since there's no Millering.
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Old 21st February 2004, 12:12 PM   #6
arnoldc is offline arnoldc  Philippines
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hi sy, thanks for the input. that seems to sound good for a driver or preamp project.
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