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Below are some very nice pre-amplifier pictures from a customer of ours in USA - using the OPTVC that we've built for him some time ago. He's looking for more transformers for upgrades, and that's why the pictures have measurement tape being shown instead of being a studio-like photos for publishing.
Here are some details of his OPTVC:
26K:26K33 step OPTVCPri inductance ~150HyPri DC 10mAPotted with turretsOFC wires
Comments from customer:
"Last year I got a TVC from you for a preamp my friend Oliver built for me. I'm liking it a lot. Very nice sound. Very happy with it. "
"Here is a photo you requested of the TVC preamp Oliver built. It is an active preamp with combined volume and output TVC with 33 steps. The TVCOPT are in the back to the left. It uses a type 82 rectifier with 6AX4 TV damper warm up buffer. Shown are 01a preamp tubes. It can also use 112a, 31 or 71a DHT tubes."
Some may ask, what the h*ll is OPTVC? OPTVC = Output Transformer Volume Control - It is TVC that can tolerate primary DC and use as a load for a tube stage. Some details can be found here:
J&K Audio Design