Landoctor said:
Donovan,
can't help you there, i don't know of any online sources for transformer cores/bobbins.
If you are referring to split bobbin types, such transformers used to be very common for diy assembly transformers.
There's an electronics (surplus) store in any direction overhere, diy electronics has a long tradition in these parts. (likely the reason for the large number of cheese/sauerkraut flag members present at this forum)
I buy bulk materials every time i visit a surplus store and see an interesting offer.
Cheap brands totally wrecked the transformer market, overhere that started ~20 years ago with Altai and Monacor junk quality products.
Jacco,
Thanks for the info. I wish I could find a local supplier for them.
Would it be possible for me to buy a couple of kits from you?
I would appreciate any help you could provide.
Thanks for your time,
Donovan
Thanks for the info. I wish I could find a local supplier for them.
Would it be possible for me to buy a couple of kits from you?
I would appreciate any help you could provide.
Thanks for your time,
Donovan
Does anyone have a good source for a transformer for this preamp. I am having a problem finding a unit with the proper specs. It seems small value units cost as much as mega transformers. Tad
A 120VCT/60VAC in parallel split bobbin type can be ordered from Allied Electronics in Texas.
A choice of 56VA to 100VA, between $15 and $25.
Allied Elec. carries transformers by Zettler from California(not relays from Germany), Hammond from Canada, Triad from China.
Zettler manufactures the prettiest ones but only to 20VA, a 120VCT/60VA Hammond would be a nice choice, about $20/pc.
No idea what the Triads are like, Triad Magnetics does seem to make pretty good ones for tube gear.
Split bobbin types can be ordered direct from Zettler, the $25 minimum order is good for four 20VA transformers.
(double C-core split bobbin transformers are tops, unfortunately the prices are scary)
A choice of 56VA to 100VA, between $15 and $25.
Allied Elec. carries transformers by Zettler from California(not relays from Germany), Hammond from Canada, Triad from China.
Zettler manufactures the prettiest ones but only to 20VA, a 120VCT/60VA Hammond would be a nice choice, about $20/pc.
No idea what the Triads are like, Triad Magnetics does seem to make pretty good ones for tube gear.
Split bobbin types can be ordered direct from Zettler, the $25 minimum order is good for four 20VA transformers.
(double C-core split bobbin transformers are tops, unfortunately the prices are scary)
Jacco
You just saved me some serious money. Thanks a bunch. How about output transformers for solid state amps. Can not seem to find many of them. Tad
You just saved me some serious money. Thanks a bunch. How about output transformers for solid state amps. Can not seem to find many of them. Tad
Re: Jacco
You're not kidding, big price savings on those transformers. Now if I can only find decent film caps for less than an arm and a leg.
tryonziess said:
You're not kidding, big price savings on those transformers. Now if I can only find decent film caps for less than an arm and a leg.
I got some ZTX 454 instead of the ZTX 450... Would they be ok? They will provide the same current for the same voltage reference yeah?
Pars
The 102va 120 volt center tap transformer would be a good choice. Will these split bobbin units give the performance we expect from the Aleph circuitry. I though toroid transformers were the norm.. Tad
The 102va 120 volt center tap transformer would be a good choice. Will these split bobbin units give the performance we expect from the Aleph circuitry. I though toroid transformers were the norm.. Tad
Anyone know how Damien ship these PCBs? It has been a month now and I have not received anything. I haven't heard from him for a few weeks either. Should I be worried?
Same problem here...
Guess the polish post order company is messing up a bit at the moment. He uses usps. He send me a picture of the shipping bill and did a reclamation of my order two weeks ago.. haven’t heard anything ever since.. he's probably out of town or something like that.
Cheers,
C.
Guess the polish post order company is messing up a bit at the moment. He uses usps. He send me a picture of the shipping bill and did a reclamation of my order two weeks ago.. haven’t heard anything ever since.. he's probably out of town or something like that.
Cheers,
C.
Ok, culture, glad to hear I am not the only one. Hopefully we will hear from him soon. 😀 He actually sent me a tracking number but I don't know who it applies to! I tried the USPS website but not luck!
I had no problem getting my boards a short while back. They did take about 4 weeks to get to the U.S. He was quite reliable on emailing questions back. Tad
tryonziess said:
THIS IS
Toroidals have become the universal transformers, read as easiest to obtain.
Their combination of a small and single direction concentrated stray field, very high peak output power and good regulation makes them the obvious (economical) choice for power amplifiers.
Those factors are of insignificant importance for the powersupply of a pre-amplifier.
A pre-amp powersupply has a constant powerdraw, peak output capability of the transformer is of no importance.
Pre-amp circuits employ regulated rail voltages, in contrast to most powersupplies of power amp output stages.
That makes the transformer regulation factor irrelevant for pre-amp use.
(click the comparison button at the link above for more items)
A direct result of the donut core design feature is a very high bandwidth, every piece of garbage that enters through the mains exits the other end of the transformer.
Winding primary and secondary on top of eachother makes it worse.
The single important feature a delicate pre-amp circuit desires is being fed by the cleanest power.
A block type transformer has a built-in bandwidth limitation, physically split windings ensure that the core filters out the bulk of the junk that enters.
The price difference between a toroidal and a traditional tranny can add a mains filter to the beloved audio project.(a single buck sometimes buys a used fancy Swiss made that does +$15 new)
Damian may have a busy semester at Polakski-U, the eye candy he sent me only took a couple of days to arrive.
Attachments
It looks llike Posts are a big problem all around the world.
I received the Aleph P PCB's from Poland in more or less 10 days.
On the other side i have been waiting for more than one month for the Firstwatt F3 PCB's from Canada and there are no news.
I know that they have been sent a the beginning of September but i did not receive them yet...
I received the Aleph P PCB's from Poland in more or less 10 days.
On the other side i have been waiting for more than one month for the Firstwatt F3 PCB's from Canada and there are no news.
I know that they have been sent a the beginning of September but i did not receive them yet...
Jacco
You have this most incredible library of parts suppliers I have every seen. Those Japanese transformers are sweet. They probably carry a serious price tag too.
I took your advice and ordered the split bobbin Hammond tranny from Allied Electronics. I also very much appreciate all of the fine input. Now where are you going to use that toy from Damien. Tad
You have this most incredible library of parts suppliers I have every seen. Those Japanese transformers are sweet. They probably carry a serious price tag too.
I took your advice and ordered the split bobbin Hammond tranny from Allied Electronics. I also very much appreciate all of the fine input. Now where are you going to use that toy from Damien. Tad
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