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Old 19th December 2002, 09:43 AM   #21
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Take a look at this thread too. It discusses the Quicksilver KT88 UL PP amp, which would also be a good one to clone. The schematic posted is for the version using the very rare 8417 tube, but hopefully someone will work out the differences and post them.

Quicksilver KT88 mono 60watt amp schematic
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Old 19th December 2002, 11:39 AM   #22
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Default FROM 8417 TO KT88/6550

Hi,

Actually the differences aren't huge and easy to do:

http://www.triodeel.com/8417.htm

You can also implement the modification to the PSU as Joe posted in the Quicksilver thread.

Easy peasy.


Cheers,
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Old 19th December 2002, 11:53 AM   #23
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Frank and others..

I will make the changes and post the amplifier section of the KT88
mono block Quicksilver amplifier next week as I am off that week and will have the time to do it. This may serve as an interesting topic as well as a good building tool to follow?

As I have nothing to compare the modified power supply to I must admit that I find it very smooth and also an am not hurting for bass response.

If I had known the information existed for modifying a 8417 amp I probably would have purchased a used pair off ebay for less than I paid for these KT88 mono's. Either way I am very satisfied with the performance of these amps.


Joe
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Old 19th December 2002, 12:04 PM   #24
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Default KT88 SCHEMATIC

Hi,

Quote:
I will make the changes and post the amplifier section of the KT88
That would be nice,thanks Joe.

Cheers,
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Old 19th December 2002, 12:18 PM   #25
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Looking at it again, I'd build the GEC over the Quicksilver, with a couple of minor mods. I'd phase split before the 12AX7s with a Lundahl LL1544A, or similar Jensen trans, make it balanced in, and put a CCS in the tail of the first two stages down to an extra negative supply (-20V?). The last is just my preference for a real diff stage, rather than PP.
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Old 19th December 2002, 12:22 PM   #26
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Default Addendum

If someone were to build the QS, a pair of Dyna 431 like those out of the Dyna Mk3 would be good candidates for OPTs.
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Old 19th December 2002, 01:29 PM   #27
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Default Tube manuals

Quote:
No, I do not have a tube manual. Where might I acquire such a thing? Do these include schematics?
There are a few online:

1) Sylvania Tube Manuals (1943,49 and 1959)
http://www.montagar.com/~patj/electro.htm
2) RCA Radiotron Tube Manual, No. R-10 (Tim Reese’s site) http://www.nmr.mgh.harvard.edu/~reese/RC10/
3) RCA HB-3 Tube Manual (Pete Millett’s site) http://www.pmillett.addr.com/hb-3_tube_manual.htm
4) Karl R. Spangenberg, On Vacuum Tubes. (Ken Gilbert’ site) Used by grad students at Stanford studying vacuum tube design in the 40s. http://ken-gilbert.com/spang/spangenberg.html

These are in the outline of online tube info I sent you.
The first 25 pages of tghe R-10 is worth the read while you're waiting for F.
At least you can see what one is.


cheers
Craig Ryder
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Old 23rd December 2002, 05:00 PM   #28
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Default DIY

What do you all think of the feasibility of a stereo SET putting out about 60W per channel? Or do you think that monoblocs would be better?

I am debating what to do here with making a project. I am eager to get going...

Regards
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Old 23rd December 2002, 05:06 PM   #29
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60W is feasable with PSE. Otherwise we're talking "exotics".
Whether monoblock or not makes no difference in performance for a properly designed system. The main reason for 2 chassis' is weight.............But as you're T_Strong...maybe you can manage
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Old 23rd December 2002, 05:48 PM   #30
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dhaen: PSE? For clarification, is that Pentode Single Ended? or am I off?
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