I've some amp schematics, from 0.5 to 4 watt, that could help you figure out the transformers specifications.
Hi all
There are some companies in the UK who still make audio transformers. Sowter even had a 1W (AC128) type driver and output in their cat - but they're not cheap. I'd recommend complementary pairs, but IF you INSIST on transformers, they might be worth looking up.
John
There are some companies in the UK who still make audio transformers. Sowter even had a 1W (AC128) type driver and output in their cat - but they're not cheap. I'd recommend complementary pairs, but IF you INSIST on transformers, they might be worth looking up.
John
Sorry, nowhere near enough open circuit inductance wound on that one.
How many you got laying around??? Maybe if you strung a few hundred
together in series.
You are looking for an iron transformer of at least half the size of your fist,
with nearly equal input and output voltages. Original purpose unimportant,
so long as its not the high frequency, pulse, or switching type.
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Here is other idea from Popular Mechanics, Punch for Portable, Jan. 1964 pg.196.
There are some reports on building a Deacy amp clone using these transformers.
There are some reports on building a Deacy amp clone using these transformers.
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There are plenty of these transformers on Ebay.
Made by Eagle, I think.
They were also available from Tandy / Radioshack.
Andy
.
Made by Eagle, I think.
They were also available from Tandy / Radioshack.
Andy
.
Thank you for this advice.
SOWTER VINTAGE AUDIO TRANSFORMERS
Are there overviews online where are listed the most URLs of such companies?
Search the archive of the russian "RADIO" magazine: ftp://ftp.radio.ru/pub/arhiv/ . Especially the early years. They're full of very detailed data. Russian germanium transistors are available at Home
HI Tiefbassuebertr
Still looking?
What do you want your driver transformer to do?
Basically you just have to determine the impedances it has to run at and set the magnetisation quite low using an air gap. Having said that it takes a few pages of maths to express the core dimensions in terms of inductance etc needed....
In terms of design, Sowters will probably develop one for you if you tell them what you need. Unless you need AC coupling it might be cheaper to use a D.C. coupled amp and a matching transformer if you need to couple to some load other than the usual 3/4/8 ohms.
Cheers
John
Still looking?
What do you want your driver transformer to do?
Basically you just have to determine the impedances it has to run at and set the magnetisation quite low using an air gap. Having said that it takes a few pages of maths to express the core dimensions in terms of inductance etc needed....
In terms of design, Sowters will probably develop one for you if you tell them what you need. Unless you need AC coupling it might be cheaper to use a D.C. coupled amp and a matching transformer if you need to couple to some load other than the usual 3/4/8 ohms.
Cheers
John
In my last post I actually wanted to say:
Overview about driver transformer brands and manufacturers still wanted
I am not able to design such a driver transformer, because all materials of the core and the kind of windings causes an effect and provides thus the individuell character and its individual sonic performance.
Additional I haven't a favorite topology, maybe the F6 from Nelson Pass - go to
http://www.diyaudio.com/forums/pass-labs/216616-f6-amplifier.html
Therefore I want to know the manufacturers, which delivers the best price to performance ratio. I know the follow brand names (but haven't experience with their devices):
Korato
Korato
http://www.diyaudio.com/forums/tubes-valves/76969-trafomatic-transformer.html
Cinemag
Line Input Transformer
Amplino
Ringkern transformatoren Amplimo
Lundahl
Lundahl Transformers - Line output transformers
Jensen
JENSEN TRANSFORMERS, INC. - LINE OUTPUT TRANSFORMERS
ZEROimpedance
Products
Welter
Welter Audio Electronic Seit 1975
Plitron
Plitron
Thank you very much.
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FWIW - REA Problem Solvers - Electronics
A good reference with quite a few examples of basic circuit analysis of such TC amps. The format is such that specific questions are asked, and then the circuits are analyzed. Much information is found by following the examples, and coupling/ output transformer requirements can be rationalized with this process.
Good luck
Terry
A good reference with quite a few examples of basic circuit analysis of such TC amps. The format is such that specific questions are asked, and then the circuits are analyzed. Much information is found by following the examples, and coupling/ output transformer requirements can be rationalized with this process.
Good luck
Terry
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