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Sets, Parts and Service Information Offered (private sellers only, exact price required, no swaps) You may announce components or sets for sale or offered free here. Private collectors only - no traders. You must include an exact price. No swaps.

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Old 19th Jul 2019, 5:12 pm   #1
Diabolical Artificer
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Default Audio transformers.

Continuing to thin out my stuff I've a few audio transformers for sale, see pics.

#1 Biggish black SE OPT Z ratio is 92:1, est OP power 5 - 7W. 5
#2grey jobbie, odd one this, the primary (?) is 352 ohms with a tap at 1r, sec is 255r, this gives a Z ratio of about 1:1 ( turns ratio of 1.1) est 3-4W- 4
#3 RS "choke" tfmr" Z ratio 298:1 approx. 3W . Unfortunately I've lost the datasheet to this but I used it in a Mullard 3-3 type build and it performed really well. The pri is tapped so you can use it as a choke as part of the PSU, it also has several "taps" on the sec for different spkr Z's. 5
#4 Shows 0/2/4/16 and pri printed on top, suspect this may be a matching tfmr, Z ratio is 1:5 - 3
#5 RS miniature OPT's x 3, two in box, one loose, Z ratio is 3250:1, 3 each
#6 Driver tfmr white box 10k:1k sec CT - 4
#7 RS transistor tfmr T/T1 1:1 CT Prim 1mA DC, two of these, one in box, one loose 3 each
#8 RS trannie tfmr T/T2 output 6.6:1 CT - 3
#9 RS trannie tfmr T/T4 output Ratio 9:1 prim 20mA DC - 3

PM me if interested, postage est 3 depending on which/how want tfmr's folk want, Andy.
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Old 20th Jul 2019, 7:35 am   #2
Diabolical Artificer
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Default Re: Audio transformers.

A few members have asked if any of these tfmr would be suitable for a battery set, specifically the RSminiature OPT's, could anyone enlighten us? I would have thought they would be too small at 25mm x 7mm approx laminations.

Andy.
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