BBC LL/252-H12 transformers - diyAudio
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Old 6th July 2014, 09:12 AM   #1
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Default BBC LL/252-H12 transformers

I spotted these on EBay UK for what looks like a very good price. There are still plenty left. The transformers have 150+150:600:37.5 windings and are specified as +/-0.1dB 40-15000Hz at +20dB when terminated correctly. Apparently each one weighs approx 500g.

AUDIO LINE TRANSFORMER 600OHM TO 600OHM OR 150 OHM TO BBC DESIGN LL/252-H12 | eBay

http://www.bbceng.info/EDI%20Sheets/10374.pdf

Given the price I thought I'd grab a few. Looks like it could be a nice 600:600 output transformer for a preamp or Vout DAC, and possibly a good matching transformer to couple low impedance headphones to a high output impedance amplifier (using the 37.5ohm winding for output).

I also wondered if the 37.5ohm winding could be used in some sort of feedback role to linearise the transformer....?

Any experience, thoughts, recommendations would be much appreciated.
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Old 6th July 2014, 09:25 AM   #2
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I should have said that these are £10.75 + delivery.
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Old 6th July 2014, 09:40 AM   #3
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grab them while you can , for that price

every decent house need to have at least 2 pairs of repeater coils ......

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