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Old 21st January 2009, 11:46 PM   #1121
AndrewT is offline AndrewT  Scotland
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I posted the spreadsheet on the Forum some time ago.
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Old 22nd January 2009, 10:22 AM   #1122
rob3262 is offline rob3262  United States
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Quote:
Originally posted by pooge
WHERE did you find TO264 insulators???

Mouser 532-4180
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Old 22nd January 2009, 08:21 PM   #1123
clm811 is offline clm811  United States
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Quote:
chas could you give us more Information about transformer
Sam,

The transformer was taken from an old 1970's receiver (in this case, a Pioneer). Some of these had nice, potted traf's that still work well today(no hum or stray fields). They may not have the 600+VA rating that many here seek, but they're gorgeous (IMHO), and not too expensive in my case.

I prefer the SX-1250 model, if you can find a non-working one locally or on eBay, as it has dual 50vac secondary windings. This makes for a good 160+W(@8ohms) stereo amp. Just ask WJH!

Otherwise, you could try to find an SX1050(120W) as I have done.

Quote:
C'mon, guys- Let's see your images!
Anyone else have pix?


-Chas

p.s. Thanks, PCHW, for turning me on to BrianGT's power supply boards. They make the layout and wiring neat & easy!
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Old 22nd January 2009, 08:58 PM   #1124
pchw is offline pchw  United States
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Speaking of savage old parts.

I totally forgot that I had a 170wpc Luxman receiver (R-117) that has blown output stages (all transistors are toasted as far as I could tell, preamp and tuner were still good) in the garage somewhere. It doesn't have the nice toroid, but the EI PT is massive. I shall dig it out and take some measurements to see I can use it!!
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Old 22nd January 2009, 10:56 PM   #1125
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Nuthin wrong with a good EI Fred -

Here is my salvage toroid. Honestly, it came from a scrap guy.

That's why I'm building the amp... I needed a good amp for the traffo
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Old 22nd January 2009, 11:32 PM   #1126
pchw is offline pchw  United States
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Quote:
Originally posted by mpmarino
Nuthin wrong with a good EI Fred -

Here is my salvage toroid. Honestly, it came from a scrap guy.

That's why I'm building the amp... I needed a good amp for the traffo
Marc,

Tell me how to dig out these kind of land mine, I will do the suicide dig
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Old 22nd January 2009, 11:54 PM   #1127
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Nice find Marc.

At the risk of sounding like an ApexJr shill, the dual 45V Genesis transformers that Steve has are awfully nice. I haven't powered one up yet, but while rated at 600VA they are as big as my Avel 800VA transformer. (well, maybe 3/16" shorter).

At $29.95 they are a steal. Courtesy of USPS flat rate shipping, I got a pair and some caps delivered for $15. The only downside is you should go to 80V caps to be safe with nominal 63V rails.

Edit: OK, I admit it. I'm trying to get these sold so I won't buy the entire stock
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Old 23rd January 2009, 06:48 AM   #1128
clm811 is offline clm811  United States
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Quote:
Here is my salvage toroid. Honestly, it came from a scrap guy.
Wow, Marc!

Tell me, did your "scrap guy" have any other(say ,"Krell") parts?

That's MY kind of scrap yard!!

Attached is pic of progress on my two mono-block chassis.
I'm using 2mm copper plate(scraps)which acts both as side of enclosure and as heat spreader to join my two 6" wide heat sinks. The front(inner), back and bottom are 1/8" aluminum plate, adding some heat dissipation as well. Front panel is 1/4" brushed/anodized. All from "scrapped" enclosures. Top screen is expanded steel mesh from Home Despot (gotta let the heat out somehow, or we'll "cook" the caps)...


-Chas
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Old 24th January 2009, 03:17 AM   #1129
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Quote:
Originally posted by clm811


Sam,

The transformer was taken from an old 1970's receiver (in this case, a Pioneer). Some of these had nice, potted traf's that still work well today(no hum or stray fields). They may not have the 600+VA rating that many here seek, but they're gorgeous (IMHO), and not too expensive in my case.

I prefer the SX-1250 model, if you can find a non-working one locally or on eBay, as it has dual 50vac secondary windings. This makes for a good 160+W(@8ohms) stereo amp. Just ask WJH!

Otherwise, you could try to find an SX1050(120W) as I have done.

Anyone else have pix?


-Chas

p.s. Thanks, PCHW, for turning me on to BrianGT's power supply boards. They make the layout and wiring neat & easy!

How sad, those sx-1xxx receivers are major collector items, even the non-working ones go high on ebay for repair parts. I decided to go with toroids from audio express.
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Old 24th January 2009, 03:31 AM   #1130
clm811 is offline clm811  United States
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Quote:
How sad, those sx-1xxx receivers are major collector items. . I decided to go with toroids from audio express.
Understood; However, I had trouble with hum from an unshielded toroid in one of my current amplifiers.

I like idea of using the steel-encased, potted traf to avoid such a problem. Like Marc, I've looked to Levinson and Krell units to see what is preferred at the "top end". Fortunately I found these excellent trafs. at very fair prices on eBay.

Cheers,

-Chas
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