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Old 24th February 2004, 10:30 AM   #141
stigla is offline stigla  Norway
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Click the image to open in full size.

Click the image to open in full size.

Here is my most recent Preamp that I buildt for my brother.

It is a Gray Pimm CCS loaded #27 circuit, using the mu output. Separate PSU unit not shown, using Choke input and SS diodes, nothing special.

stigla
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Old 24th February 2004, 01:17 PM   #142
Layberinthius is offline Layberinthius  Antarctica
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Hmm nice! is that a balanced horizontal mic socket as your B+?

How and Where did you find out that they are suitable for the task? if this is so...

Btw I love the woodwork and the fine display of old-style steel panelling with no chokes visible above!
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Old 24th February 2004, 02:28 PM   #143
Sherman is offline Sherman  United States
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My first tube project. I'm sorry I built this, I can't stop now!
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Old 24th February 2004, 06:13 PM   #144
planet10 is online now planet10  Canada
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Quote:
Originally posted by Sherman
My first tube project. I'm sorry I built this, I can't stop now!
Is that one of those 11MS8 PP amps? (i think i've got the tube right -- a hard ome to remember)

dave
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Old 26th February 2004, 08:42 AM   #145
stigla is offline stigla  Norway
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Quote:
Hmm nice! is that a balanced horizontal mic socket as your B+?

How and Where did you find out that they are suitable for the task? if this is so...

Btw I love the woodwork and the fine display of old-style steel panelling with no chokes visible above!
Thanks!

Yep, thats a standard XLR male contact. They're rated for 250V AC. (this gives perhaps 250V*1,414 = 353V DC???)
I just tried one out, and no shorts have ever happened They are tested for no shorts at 1500V AC peak, so...

I use the female contact for the part actually carrying the B+ voltage when the parts are not connected.

stigla.
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Old 27th February 2004, 06:31 PM   #146
Layberinthius is offline Layberinthius  Antarctica
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Thanks for replying

If I go along with a seperate power supply chassis I think I'll be using a couple of em, don't know if they can handle 525-600volts DC at 100watts per side tho :P

We shall see...

Maybe i'll setup a simple voltage doubler with a few high-voltage paper in oil caps I have hanging around like 660volts AC aka 800 something DC... charge a few of em up on a voltage doubler and disconnect then let em rip

Btw, Kudos yet again on using that metal and panelling I love to see non-protruding screws in any valve equipment :P

Cheers..
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Old 27th February 2004, 11:26 PM   #147
Sherman is offline Sherman  United States
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Quote:
Originally posted by planet10


Is that one of those 11MS8 PP amps? (i think i've got the tube right -- a hard ome to remember)

dave

Yes it is (and yes it is, remembering that tube number I mean). I made changes only to accomodate the case (different volume pot, added the input selector (right hand knob), illuminated on/off switch instead of the stupid inline lamp switch that comes with it and a real fuse holder, again rather than the inline one that comes with it.

Other changes (but not to the real circuit) include filament snubbers and a cap across the HV. It sounds very good and has sufficient power to run my old Advent /1 speakers. (I've since built a pair of speakers so I'm not using the Advents with it anymore.)

I think that with the cost of the kit ~$150 US including shipping, a few caps, a rotary switch for the input selector, a set of RCA jacks for the inputs on the back, the knobs and the cool Padauk wood (that case has no stain at all, only three coats of clear poly) I probably have ~$200 US in it.
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Old 28th February 2004, 06:11 PM   #148
pingfloid is offline pingfloid  Thailand
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Default Cheap skeleton chassis

Here is my under-construction SE with KT88. I am using steel rack accesories that someone did throw to the bin.
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Old 29th February 2004, 02:34 AM   #149
Layberinthius is offline Layberinthius  Antarctica
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OO0oohh A very interesting amp !

I love KT's

****rubs those Hammond trannys****

What's with the 9 pin sockets?

hehehe
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Old 29th February 2004, 07:59 AM   #150
pingfloid is offline pingfloid  Thailand
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Quote:
What's with the 9 pin sockets?
The 9 pin sockets are impatiently waiting for ECC83's. The rectifier is a 5U4G and the 2 empty holes will be for a future phono stage.

I am following this schematic:
http://www.bonavolta.ch/hobby/en/audio/kt88_1.htm

I'm using Hammond 1627SE instead of the Tango U-808

I will write further comments about it at this thread:
power amp using kt88

Layberynthius Maximus, ┐have you finaly built this one?:
http://www.plitron.com/pages/Products/Audio/vtvkt88.htm
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