But not getting into how to draw the loadline. It's a long history, don't want to talk about it anymore. Just transformers here.Confused, didn't you start the thread with a request for OT suggestions?
But not getting into how to draw the loadline. It's a long history, don't want to talk about it anymore. Just transformers here.Confused, didn't you start the thread with a request for OT suggestions?
You make my day, You actually compare Edcor and Hammond and Hammond won!!!! Now I am excited about the Hammond 1650T. I think I can live with 1.9K primary. I can live with $150ea.
Confused, didn't you start the thread with a request for OT suggestions?
But not getting into how to draw the loadline. It's a long history, don't want to talk about it anymore. Just transformers here.
I don't think so, I move from guitar amps to SS power amp to this in the last 5 years. I don't stay in one area that long. Even in my career, I jump to different field in electronic from job to job. From designing digital scope front end for LeCroy, to Exar designing analog IC, to frontend of Ultrasound medical scannel for Seimens, to mass spectrometers, to defense contractor for military........... Never stay in one particular specialty. Too boring to stay in one field for years.That's cool. I've been reading Pak's posts here for a decade. Look forward to reading yours here in 10 too. Do post what you come up with.
Jack of all trades...
Hi Kevin
Alan - From the list you showed, you are looking for a 100w, dual secondary transformer. That's going to cost. How about trying a 50w, single secondary tranny? It will be cheaper and should be able to prove out your design with it. I have used both Edcor SE and CXPP trannies and I like them. Now they only deliver 20Hz-20kHz but do you really want a transformer that goes out to 175kHz ? Seems excessive.Hi
I know I have been talking about this here. I am desperate to find a little more reasonable priced OPT with primary impedance between 2K to 2.5K to do the first run prototype for me design. I really don't want to spend over $700 for a pair of good OPT on the first try. The only one that is reasonable is Edcor that is $110 each. But through communication with Edcor, I am not too confident with them. I have not managed to find anything in between Edcor and the more exotic Lundahl/Sowter or even Plitron.
Only other a little more reasonable is SAC from Thailand:
View attachment 1057888
Hammond has the 1650T that is 1.9K primary and it's $148 each + shipping. 1.9K is pushing it. More importantly, from things I read, Harmond is not exactly an upgrade to Edcor!!!!
I am output of ideas. Anyone have anything else? Or any more encouraging things to say about Edcor to make me feel better in buying the Edcor?
Alan - From the list you showed, you are looking for a 100w, dual secondary transformer. That's going to cost. How about trying a 50w, single secondary tranny? It will be cheaper and should be able to prove out your design with it. I have used both Edcor SE and CXPP trannies and I like them. Now they only deliver 20Hz-20kHz but do you really want a transformer that goes out to 175kHz ? Seems excessive.
Ha, I just notice it has a feedback secondary.1650T is dual secondary.
Why are you building a gNFB amp?
cheers,
Douglas
Ha ha, Hammond just confirmed they do more interleaving than just the UL taps, that they actually have to have two secondary to accommodate the interleaving.
What I meant is with UL tap, by default, it has at least 4 sections already as there are 4 winding from the top tap, UL, CT, UL and bottom tap they have to pull wires out. From the description in Hammond, I strongly they have more sections than the minimum 4 sections.