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Old 20th October 2010, 09:22 AM   #381
GKU is offline GKU  Switzerland
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Jacco,

Thanks, you are correct.
The 108/370 where earlier developed on the request to reduce device dimensions an ever ongoing requirement in the semiconductor industry.
The difference is, the 74/170 types in TO92 cases will be faced out and only the production of the smaller types 108/370 will continou.

Gerd
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Old 21st October 2010, 04:07 PM   #382
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Those HexFred diodes arrived in two days from the USA from DigiKey. What an extraordinary world we live in! I was wondering whether to order some of the BA-2 matched mosfets from tech-diy. Anyone have any experience of this outfit?
Regards,
Chris
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Old 21st October 2010, 06:02 PM   #383
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No complaints about our Jack.

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Old 21st October 2010, 06:09 PM   #384
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I thank you.
Chris
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Old 25th October 2010, 12:09 AM   #385
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Quote:
Originally Posted by Backbones View Post
Those HexFred diodes arrived in two days from the USA from DigiKey. What an extraordinary world we live in! ...
Regards,
Chris
Yes, an absolutely amazing world! And to think that FedEx, UPS, DHL and all the rest pickup and deliver more than 20 Million packages per day with mind boggling efficiency ... and this during a world wide recession. (UPS logistics is planning on seeing this traffic double over the next few years, recession or not!)

... and it is rare to see a frown on the delivery person's face!
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Old 26th October 2010, 11:54 AM   #386
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I was just about to put an order in for two 300VA toroids, each with two secondaries of 0-18V when I re-read the BA-2 info. Nelson suggests for each channel 6 pairs of mosfets when a single power board contains 3 pairs. So if I am going to use just one board for each channel will I actually need a total of two 300VA toroids? What could I get away with?
Regards,
Chris
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Old 26th October 2010, 12:53 PM   #387
AndrewT is offline AndrewT  Scotland
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ClassA power amplifiers are not cheap.
Transformers are just the tip of the heat-berg.
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Old 26th October 2010, 12:56 PM   #388
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What you can get away with is not the right approach to diy.
The question should be "What size transformer should I use to get the best sounding BA-2"

Don't underestimate the work involved in building an amp.
I have built several amps over a few years and none of them are in cases. I am halfway through the cases as we speak but it has taken me many hours more to do this than I expected.
If I were to put a dollar figure of about $40 an hour for my labour, it is not worth trying to save $100 here or there.
For me 300VA is a bare minimum. There will come a time when you might want to increase the bias or build another amp. If you go with the smallest transformer you can get away with you might find that you will need to buy bigger one later on. If that happens you won't be saving money you will be wasting money.

Last edited by Melon Head; 26th October 2010 at 01:03 PM.
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Old 26th October 2010, 04:24 PM   #389
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Could someone explain for me please the connection "D" in the BA2? As far as I can see, it is the connection between the front end and the power stage. If that is so, what is "OUT" on the BA2 front end?

Thanks
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Old 26th October 2010, 05:45 PM   #390
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Hi highfieldrebel,

you're right, D is the connection between the front-end and the output stage, where the signal goes through. I guess it's supposed to stand for drive or so. OUT is however not the output of the front-end but a feedback connection from the output of the output stage (which is, where you connect your loudspeakers to). Those declarations are maybe a bit confusing at the first look...

~ nightrush
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