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Old 28th April 2008, 06:11 PM   #31
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Thanks TY and GORDON.
Two shots for my corner !!
Just out of curiosity, does it get hot enough to make toast at 3 feet ?
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Old 28th April 2008, 06:19 PM   #32
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Wish I could take credit for it, but alas it is not mine. The gentleman's name is Jeff Davison. I'm not sure if he posts here. You can find the rest of the photos and read more about it here:

http://www.diytube.com/phpBB2/viewtopic.php?t=1289
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Old 28th April 2008, 07:07 PM   #33
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Wow !!!
That'll give some of the guys here a heart attack.
Nice job, very nice, but wait for all the negativity to come back on it.



PostPosted: Fri Jan 12, 2007 4:19 pm Post subject: Finished the wiring, another 10 lbs stuffed in a 2 lb bag Reply with quote
Now on to testing....

Anyway...thanks for all your help here in the forum.

Details:
Edcor 60 output transformers
2 Toroid Corp tube power transformers
Corcom power entry module with filter
2 C.Chong capacitor boards
Mapletree "Special Red" driver board.
Soundtastic Dyna ST-70 chassis
Dynakit cover.
Lotsa NOS RCA tubes

Object was to do a true dual mono 60 wpc amp with ST-70 wrapings as I like the nostalic style and form factor.

I was going to upgrade all the components on a stock ST-70 I got on eBay, but decided just to start from scratch with all new bits (NOS for the tubes)

I've grown to love solder fumes Yellow_Light_Colorz_PDT_15

http://s130.photobucket.com/albums/p...&current=2.jpg
http://s130.photobucket.com/albums/p...&current=4.jpg
http://s130.photobucket.com/albums/p...&current=5.jpg
http://s130.photobucket.com/albums/p...&current=7.jpg
http://s130.photobucket.com/albums/p...current=10.jpg
http://s130.photobucket.com/albums/p...current=12.jpg
http://s130.photobucket.com/albums/p...current=15.jpg
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Old 28th April 2008, 09:59 PM   #34
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Quote:
Originally posted by Ty_Bower
Wish I could take credit for it, but alas it is not mine.
Quite frankly I don't know why.

All that time and money (some expensive parts in that amp) all to turn around and save $50 on a chassis by stuffing it in a ST70. Not to mention how much the life of the amp as a whole has been shortened.

And then there is the aesthetics, the ST70 wasn't exactly ever a great looking amp - much less like this.

Since you were already at Antek, why didn't either of you get one of the great Parmetal amp cases they sell!! Doh!? Or two and make a set of monoblocks? They even have a

ebay store!!
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Old 28th April 2008, 10:25 PM   #35
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"Quite frankly I don't know why. "

"Object was to do a true dual mono 60 wpc amp with ST-70 wrapings as I like the nostalic style and form factor."
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Old 28th April 2008, 11:34 PM   #36
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Quote:
Originally posted by itsmejto
"Quite frankly I don't know why. "

"Object was to do a true dual mono 60 wpc amp with ST-70 wrapings as I like the nostalic style and form factor."
If nostalgia was the motive, you should keep it original or very close.

I would like to point out that 1. The first thing I said no one was deliberately trying to be mean. and 2. You haven't listened to *ANY* of the criticism here, despite the fact it's valid criticism.

No one cares if that was an amp for your own use, the fact is you said, "I'm building it to sell on ebay - screw the sucker that gets it." Basically, more or less that was the gist of your post. It was clear, I'm doing this for my own fun to see if I can, who cares who ends up with the thing and has to maintain it...

All the "negativity" has been most valid - you stuck a chevy 350 in a yugo of sorts - again to dupe someone with no tube experience.

Let me be really clear about that: it's lame.

Tube amps at their worst are lethal. You have a responsibility to design and engineer safe and reliable equipment - whether you currently realize it or not.

And then that's not even getting to the fact you would have been better off restoring the ST70 and building your 80watt amp separate. The additional financial cost would have been minimal and this entire thread would have been avoided.
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Old 29th April 2008, 12:51 AM   #37
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Seems that you really enjoy knocking other builders if it doesn't suit your standards. Now your'e complaining about someone elses build.

Perhaps you didn't read the bit about the weener safety resistor.

And as you are so concerned about me selling it on Ebay in this condition, to some poor unsuspecting person, did it ever cross your mind that someone might even want one like this ?

Besides which, I'd never sell it to someone who didn't know exactly what they are buying. (weener resistor included, no charge)

BTW, I also owned a Yugo.
For $3200.00 it was a great car.
Wish it had a v8 though.
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Old 29th April 2008, 02:14 AM   #38
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I guess I'm being naive. Buyer beware they say. As said already, "don't buy amp on ebay."

Shame you've not gotten anything out of this... you just keep taking it personally... which as i said and said again... is your fault and yours alone. You got this by saying you want to pawn it off on someone.. and no, it didn't occur to me (or any one else) that someone might want that.

People like you don't belong in DIY - even if you have the technical skills. When you can't take safety and common sense as a precursor to the greed for more power and you willingly ignore someone else's well being, you are dangerous, and we don't need people like you.

And again, just cause I think the amp looks bad - had nothing to do with my concerns. It was entirely the fact you are involving a 3rd unknowing party - and as such, no smart remarks or like minded build photos will redeem you.

So, let me say it again, I DON'T CARE what you do. I (and the others) only care cause your monstrosity is intended for someone else... an unsuspecting buyer. That is still lame.

What next? Advertise laptop computers for sale and then not ever send anything? After all, maybe someone WANTED to get ripped off...
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Old 29th April 2008, 02:51 AM   #39
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But you're wrong, I am getting something out of this.
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Old 29th April 2008, 02:54 AM   #40
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Quote:
a chevy 350 in a yugo
That would be interesting. 350 in a Vega, common. 350 in a Chevette, highly unstable at speed due to the short weelbase. 350 in a Supra, cool, my friend drove it daily for years till he got a Cadillac. It was well designed (by a felow engineer) and built. Building high powered cars requires rules, common sense, careful planning. Fortunately any NHRA sanctioned track will enforce those rules so that risk to humans is minimized.

High voltage electronics caries similar risks. There are several pages on my web site explaining those risks. At least my customers know what they are getting into.

I'm not even going to comment on the amp again, but:

Quote:
Price includes a darn great big 5000 ohm 100 watt wire wound resistor mounted in a seperate fan cooled box for all the weeners that want a 20 watt kt88 amp. .... Perhaps you didn't read the bit about the weener safety resistor.
I read about the weener "safety" resistor, please enlighten me as to what is does, and how you hook it up?

Quote:
However- if I was the original poster, I'd be inclined to run something in screen-drive mode (6AV5/6JE6 or something like that), to get that kind of power in that small of a space. At least then, the tubes would be idling at close to Class B, which would SEVERELY reduce the heat under normal circumstances. Would at least give them half a chance of surviving in that cramped of a space...
Been there, built that. The hotest thing on the bench was the 500 watt load resistor.
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