Please help with Stancor A-4416

[arnoldc]

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.

[audiobot]

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

[MIKET]

With a signal generator and scope you can figure it out quite easily.

[arnoldc]

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?

[SY]

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.

[arnoldc]

hi sy, thanks for the input. that seems to sound good for a driver or preamp project.