I have acquired about 400-500 brand new Rotel Transformers. Rotel used to...or maybe still does im not sure...used to make their service centers buy and stock a certain number of products, boards, cables, connectors and...Transformers...which never fail. so over the years these would just pile up. From my previous experience selling transformers, there hasn't been much interest in stuff for solid state gear...BUT. before i send these all off to scrap...would anyone have interest in any?? if it is worth while i can post some. I have transformers from most of the more recent products in the last 10 years. preamps, power amps, toroids, EI core, R-Core potted. etc etc....problem is. I have Rotel part numbers and SOME say what they were for RC-1550, RSX-xxxx, RA-1555, A-12 etc etc but I don't know what the voltages or current ratings are for any of them. a person would have to research them and I do not have the time nor the desire to do so for a $10-$20 item.
OR, I could do a mystery box...$50 and i send you a box of random transformers and you figure it out.
I just HATE scrapping perfectly good parts! and Rotels transformers were REALLY nice! the canned potted Preamp transformers are really really nice units. and i just do not have the space nor the time left in my life to deal with them all LOL
SO....any interest? any takers? I would LOVE to make a one time deal for all of them! I have a ton of other Rotel parts i need to deal with. boards, chassis covers, etc etc
I am in minnesota and I can ship as I have time between family obligations, biz, work etc.
ZC
OR, I could do a mystery box...$50 and i send you a box of random transformers and you figure it out.
I just HATE scrapping perfectly good parts! and Rotels transformers were REALLY nice! the canned potted Preamp transformers are really really nice units. and i just do not have the space nor the time left in my life to deal with them all LOL
SO....any interest? any takers? I would LOVE to make a one time deal for all of them! I have a ton of other Rotel parts i need to deal with. boards, chassis covers, etc etc
I am in minnesota and I can ship as I have time between family obligations, biz, work etc.
ZC
Here are some photos. this is just some of them
Attachments
SOLD!
the lot of these have been sold. thank you everyone for your interest!
the lot of these have been sold. thank you everyone for your interest!
I picked these up (500 was an overestimate, more like 100 which is still a lot of couse, but made it easy on ZC) and plan to figure out what they all are spec wise and qty of each. I'll keep a handful for projects that fit my needs and then sell rest on the cheap as a way to give back to the community. Hopefully I'll have it all figured out after the holidays. If Rotel won't provide specs, I might be reaching out to others for help on measurement best practices as I'm looking to learn up on transformers through a hands on approach. If anyone knows the windings, VAC, amperage of any model in those photos, I'm all ears. I've had little luck so far with the few Google searches I've accomplished so far.
The VA rating of a transformer is a strong function of its core area which correlates strongly with its weight. So you can sort them by weight to start.
The current rating of the wires can be determined from the cross-sectional area of the winding. In the past I've designed for 3 A/mm^2. You can also get an idea from the DCR of the windings.
The best would be to get specs from Rotel ... if they have them.
Tom
The current rating of the wires can be determined from the cross-sectional area of the winding. In the past I've designed for 3 A/mm^2. You can also get an idea from the DCR of the windings.
The best would be to get specs from Rotel ... if they have them.
Tom
Antek does a good job of listing the weights for the different VA transformers. Maybe that would be a good place to start. You could list them or maybe even do va/lbs to get a general ratio and see if it is consistant through the different sizes. Then do the same with a couple of other manufacturers that list their transformer weights. Maybe Noratel, Toroidy etc.
You can do a resistance check to identify how many primaries and secondaries there are. Assuming all of the secondaries are lower voltage than the primaries, the resistance across each secondary should be lower than the primary side as the secondaries have lower turn counts. Then if you have a low-voltage AC source, you can inject it into the primary and see what comes out the other end. If the voltage is higher then you need to flip it around as I don't believe the transformers will step up in voltage.
You can do a resistance check to identify how many primaries and secondaries there are. Assuming all of the secondaries are lower voltage than the primaries, the resistance across each secondary should be lower than the primary side as the secondaries have lower turn counts. Then if you have a low-voltage AC source, you can inject it into the primary and see what comes out the other end. If the voltage is higher then you need to flip it around as I don't believe the transformers will step up in voltage.