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Old 15th March 2010, 12:09 AM   #31
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OK,...OK..........15.94 MB of instructions??????
Nearly Sixteen Mega-bytes of instructions? Even the word Mega....shouldn't be in a tube lovers vocabulary...except for frequencies we are trying to filter out.
That was enough time for me to scrub down the living-room floor.
Thirty two pages of instructions.
And, and SMDs' ????? "Daddy?... were you born when S M Ds' came out"??
So how much of a time gap is that....when the ST-70 came out & SMDs arrived?

What was that saying about a silk purse & a Sows ear?
Really.... I'm NOT trying to still up the pot....with so MANY choices lets think up some more examples. What does George have that would be suitable?

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Old 15th March 2010, 12:18 AM   #32
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Originally Posted by Richard Ellis View Post

OK,...OK..........15.94 MB of instructions??????


.
I give up, where was that hybrid ?
Much easier to construct !
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Old 15th March 2010, 12:20 AM   #33
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At least the SMD's were big enough for these old eyes to see them.

Technically if the word Mega shouldn't be in a tube lover vocab then am I safe to assume you are interfacing with this site on punch cards?
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Old 15th March 2010, 12:23 AM   #34
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Originally Posted by SGregory View Post
At least the SMD's were big enough for these old eyes to see them.

Technically if the word Mega shouldn't be in a tube lover vocab then am I safe to assume you are interfacing with this site on punch cards?
Not quite that old !

I used to program for a company on a Sinclair Spectrum and microdrives !

Clive Sinclair once said 48K would be the most anyone would ever need !
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Old 15th March 2010, 12:31 AM   #35
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I have the power supply from an old 5 Meg Winchester Drive that weighs nearly 100lbs. I use it as power supply for my foam cutter. iirc the platters were 24" in diameter.

Yes we had to use punch cards to enter the programs. We were allowed to use the terminals only after we mastered cards. It was a transistor computer though.

I am not saying the st70 is the amp to build, but I guess if one was REALLY against SMD's then just replace them with a axial type.
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Old 15th March 2010, 01:03 AM   #36
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What does George have that would be suitable?

AFAIK, George does not yet have a "Simple PP" to sell.

I agree with the comments disparaging SMD parts for DIY purposes. The Triode Electronics ST70 driver board is all through the hole mounting. After some practice, to get the soldering skills up to snuff, the OP should be able to stuff the board and take care of the point to point work needed to complete the project. A 25 W. or so "Rat Shack" iron, along with 63/37 SnPb eutectic alloy/RA flux solder, rates to be satisfactory.

The understandable decision to retain the Polk speakers drives everything else. Speakers 1st, then an amp is proper procedure.

The OP asked about kits. If a scratch build was being entertained, I'd suggest "El Cheapo" style circuitry using 7591 O/P tubes. Power O/P is adequate, the circuitry is comparatively simple, and a separate control center is not needed. Look at the 7591 data sheet. IMO, the "fixed" bias/ultralinear operating conditions set is noteworthy. High bang for the buck Edcor CXPP60-4-6.6K O/P trafos would be used. It's too bad Edcor doesn't offer a model CXPP60-6-6.6K, as that would be "perfect".
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Old 15th March 2010, 01:17 AM   #37
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For 40$ engineering charge, EDCOR will make anything. Even then it is still a good price/value.
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Old 15th March 2010, 01:31 AM   #38
Glowbug is offline Glowbug  United States
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Quote:
OK,...OK..........15.94 MB of instructions??????
Nearly Sixteen Mega-bytes of instructions? Even the word Mega....shouldn't be in a tube lovers vocabulary...except for frequencies we are trying to filter out.
That was enough time for me to scrub down the living-room floor.
Thirty two pages of instructions.
For a newbie, I'd say that you can't have too much in the way of instructions
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Old 15th March 2010, 02:00 AM   #39
Jaime is offline Jaime  Uruguay
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This is a nice high quality PP EL84 12wpc.
2 x 12 watt ultralinear EL84/6P14P power amplifier.
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