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Driving the TakeT H2 - Page 7

post #91 of 181
hm, so taking two of the BH toroids and paralleling the secondaries would give 0.3 A per channel, and at 350 V rails, I suppose that might be enough ..
post #92 of 181
Quote:
Originally Posted by spritzer View Post

Does anybody know the TakeT XLR pinout so I can post the directions for a Taket->Stax adaptor?
Sure:

Pin 1 is Left +

Pin 2 is Left -

Pin 3 is Right -

Pin 4 is Right +


Some more info, I have been listening through the Yamaha amp (60V p-p capable) without the TR2 and it distorts around 10 - 15V p-p depending on the music.

Dr. Takei recommending a 10V p-p amp as a minimum as he has done in a message to me, means that the H2 will be getting around 200V depending on the frequencies of the music. This is not loud enough for some music, to my ears. 300V is a more realistic minimum for realistic peak levels on some classical music. 4-500 available would be better

I'm still trying to work out which way to go for an amp (KGSS probably) or possibly a suitable transformer to work with a Sig. 30.2. I don't know if that will work yet.
post #93 of 181
Quote:
Originally Posted by stevenkelby View Post
Sure:

Pin 1 is Left +

Pin 2 is Left -

Pin 3 is Right -

Pin 4 is Right +
Here is the Stax socket so the connections are easy to work out.


For those that would like to make the adapter with the WPI plugs Allied sells the pin configuration would be:

XLR -> Stax plug

Pin 1 is Left + -> Pin 3

Pin 2 is Left - -> Pin 4

Pin 3 is Right - -> Pin 5

Pin 4 is Right + -> Pin 2
post #94 of 181
Thank you guys for being as intelligent and skilled as you are to put this all together. For those of us that are inept in the area of electronics building there is only one question. Who is willing to build these amps for the average consumer that wants it but can’t build it? I would be very interested in a KGBH-SE if someone has an extra lying around I would settle for a recommendation on a quality builder though
post #95 of 181
Though the KGBH is by no means a beginners project most builder that are at least semi competent could throw it together if they had the PCB's.
post #96 of 181
Where would one acquire these PCBs?

If I had ALL the parts easily available in a kit, I would take the time to learn what extra skills I may need to know and build one.
post #97 of 181
Quote:
Originally Posted by stevenkelby View Post
Where would one acquire these PCBs?

If I had ALL the parts easily available in a kit, I would take the time to learn what extra skills I may need to know and build one.
x2 on finding them but I'll leaving the building to the pro's!
post #98 of 181
First off, this isn't a beginners project by any means and it should only be considered for someone with a lot of experience, not only with building but more importantly testing the amp to see if it runs correctly. An amp like this will kill you under the right circumstances. You have been warned!

You should ask Kevin to see if he has the files so you can have the boards made, they could even be in the article on Headwize but I haven't checked in a while. Selling the amp as a kit would be pretty hard to do but certainly doable.
post #99 of 181
I understand it would be very complicated to build, that's what we pay pros like Justin for. I can solder very well and have repaired PCBs and built basic circuits but lack the technical knowledge to understand what's really going on and test things.

Realistically I'd have to admit it's just not going to happen I guess!
post #100 of 181
A good soldering technique goes a long way and is sufficient for many builds including simple tube amps. The experience kicks in when something goes wrong as it often does and you need to figure out what it is.

I think the Take T users should also try to look for better transformers as good speaker amps, vintage for instance, are cheap and transformers can sound very good indeed. Has anybody compiled what the specs need to be and asked the major suppliers (Sowter, Lundahl, Tamura, Iso, Electraprint etc.) if they have a suitable item in stock or what it would cost to produce it?
post #101 of 181
Quote:
Originally Posted by spritzer View Post
I think the Take T users should also try to look for better transformers as good speaker amps, vintage for instance, are cheap and transformers can sound very good indeed. Has anybody compiled what the specs need to be and asked the major suppliers (Sowter, Lundahl, Tamura, Iso, Electraprint etc.) if they have a suitable item in stock or what it would cost to produce it?
Yes I went through a couple weeks of trying to figure this out but being as how I am ignorant of what's really required, I couldn't ask the right questions I think. I took a lot of measurements and Kevin Gilmore helped me with the data. I tried Lundahl, magnaquest and another company mentioned elsewhere in this thread or another, can't remember where.

They all said that the chance of success with the first try,especially without them having the headphones there, was practically zero.

I hope someone figures it out though.

I can forward you my poorly worded, lengthy email if you send me your email address.
post #102 of 181
The best bet would be to send them the phones but the right specs should suffice. I find it a bit odd that there isn't one stock output trafo out there that can be used...
post #103 of 181
its hard for me to believe the Lundahl LL1688 wouldn’t do the job,
of course at 5 kG and eu220+ ea they'd make impressive headphone accessories
http://www.lundahl.se/pdfs/datash/1688.pdf

of course this could easily be a Safety Hazard, depending on wiring, amplifier, and H2 internal construction - you must be aware of Electrical Safety Requirements
http://www.head-fi.org/forums/showpo...6&postcount=84

any low distortion xfmr drive amp should use the "mixed feedback" technique pp73+ of Walt's signal amplifier chapter:
http://www.analog.com/library/analog...h6_final_I.pdf
just replace the output op amp with paralleled TDA7293
post #104 of 181
Quote:
Originally Posted by jcx View Post
its hard for me to believe the Lundahl LL1688 wouldn’t do the job
I would have thought so too, but here was their reply when I asked about the LL1620 or 1688:


Quote:
Hello Steven,

I am afraid I can not suggest a transformer for this rather odd application
and to any extend take a responsibility for the results.
Of course you can use one of our tube output transformers backwards, but
they are quite oversized for the application.

Sorry that I can no be of more help.

- Per Lundahl
Well I guess they propose that a tube output transformer backwards would work, if oversized. They didn't say it's not going to do the job or anything I guess.

If someone else can try it and report back with great success, I would buy.
post #105 of 181
The output trafo would be used backwards so a push-pull unit with a CT on the primary would effectively balance the phones when used the other way around but the company's will never recommend anything without testing it extensively in house.
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