This guy has been the subject of a lot of talk over the years by people who want to diy the infamous BA6a compressor, or fix a dead one.
Rare, expensive and prone to failure.
Thanks to Neilsk we have a dead one on the bench.
What's inside?
A lot of turns of very fine wire sitting on a butt stacked alloy L lamination core. I did not see a paper gap.
This means twin coils. And there are two pies on each coil for both the primary and secondary.
Wound sec-pri.
Ratio is 1:2 p-p plates to grids
Pri turns: 1800 each pie of #36= 7200 turns.
DCR is 475 ohms for each identical pie so 1.9 K total.
Sec turns: 3600 each pie of #44 (yikes!) so 14,400 turns.
DCR (est) 12 K ohms
The L lam is not in my Magnet catalog but is like a 4 L with a shorter leg. The nickel alloy has some corrosion so it is hard to determine the nickel content by sight. Will do inductance test with test coils to find Permeability and inductance.
1.115" stack by 1/2 inch tongue = 3.596 cm^2
Lam thickness is 0.015"
Probably started out as 0.014" but they did not dry out the core tube so moisture caused lam corrosion.
105 RMS volts primary will generate 5 K Gauss at 20 Hz.
There was no wax impregnate in the coils so the turns were free to rattle and break. I would not buy one of these expensive transformers as by now they have just about had it.
Interesting is that I believe the infamous Triad HS-29 (Pultec innerstage) has 1800 and 3600 turns on their single coil XFMR IIRC.
Pictures tomorrow,
Rare, expensive and prone to failure.
Thanks to Neilsk we have a dead one on the bench.
What's inside?
A lot of turns of very fine wire sitting on a butt stacked alloy L lamination core. I did not see a paper gap.
This means twin coils. And there are two pies on each coil for both the primary and secondary.
Wound sec-pri.
Ratio is 1:2 p-p plates to grids
Pri turns: 1800 each pie of #36= 7200 turns.
DCR is 475 ohms for each identical pie so 1.9 K total.
Sec turns: 3600 each pie of #44 (yikes!) so 14,400 turns.
DCR (est) 12 K ohms
The L lam is not in my Magnet catalog but is like a 4 L with a shorter leg. The nickel alloy has some corrosion so it is hard to determine the nickel content by sight. Will do inductance test with test coils to find Permeability and inductance.
1.115" stack by 1/2 inch tongue = 3.596 cm^2
Lam thickness is 0.015"
Probably started out as 0.014" but they did not dry out the core tube so moisture caused lam corrosion.
105 RMS volts primary will generate 5 K Gauss at 20 Hz.
There was no wax impregnate in the coils so the turns were free to rattle and break. I would not buy one of these expensive transformers as by now they have just about had it.
Interesting is that I believe the infamous Triad HS-29 (Pultec innerstage) has 1800 and 3600 turns on their single coil XFMR IIRC.
Pictures tomorrow,
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