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Scott Copley 203 Console

BTW, that "Pro/Comm" 12AX7A is in the same area as 3 of the Teles. They all seem to be amp tubes rather than EQ or tuner. I'm going to try to find a place to test my tubes. Assuming that the Tele's all test good, I suspect that the Pro/Comm was to replace a defective tube and that I sould try to get a single Tele from eBay to replace it.

What say ye?
 
12AX7's seldom die. Honestly I wouldn't even mess with testing them if the thing is working.
 
gadget73 said:
12AX7's seldom die. Honestly I wouldn't even mess with testing them if the thing is working.
Click to expand...

So should I get one more Telefunken? It seems to me that at least one 12AX7 must have died at some point in this things life. I can't see why there would be six matched tubes and one oddball from the get-go.

(BTW, I just love that spell check wants to turn "Telefunken" into "Garfunkel".)
 
It depends where its used. It might be in a spot where you'd never notice it. If its not in the audio path, I would not bother replacing it. Then again, I'm not wholly sold on the need for matching every tube in a unit either. My Magnavox amps have mismatched phase splitter tubes and I'll be darned if I can tell a difference.
 
gadget73 said:
12AX7's seldom die. Honestly I wouldn't even mess with testing them if the thing is working.
Click to expand...

Interesting. I was getting some erratic performance from my "new" Scott 222-D and found that two of the 4 12AX7's tested bad. I swapped all 4 out for matched pairs of Telefunken and RCA 12AX7's I had laying around. Problems went away.
 
Depends where they are used in the circuit I guess. Generally speaking though, most circuits don't use a 12ax7 in such a way that they get abused, so most of the time if the heater is working, so is the tube. Not always tho. Tubes are also funny in that the only way to really test them is in the circuit you want to use them in. A tube that fails in one spot might work just fine somewhere else.
 
Would it be sacrilege to do a couple small mods on a piece this old?

Here is what I am thinking...

1.) The internal speaker wire (looks to be 20 gauge) terminates to RCAs on the tube panel. I think there is room at the bottom of the jack panel (at the black power amp part) to add binding posts. I would have to drill holes of course. If I don't mod this, I can still redo the speaker wiring and connect to the "external" speaker terminals since each is independently switched, but I think the mod would be more elegant.

2.) Inside the cabinet between the receiver and table is a bit of space. I am thinking of drilling a small hole and mounting a 1/8" TRS jack that will terminate in RCAs at the other end. I would send this to the "extra" input on the back and it could be used for a CD Walkman and/or my daughter's MP3 player. Who wants to move a 100+ lb console every time they hook up an iPod?

What do you all think?
 
That was my guess. Thanks for validating. I assume you would try to find a single Telefunken to replace the "Pro/Comm"? Do you know anything about that tube?
 
You probably don't need to be spending Telefunken $ to replace that tube.
Pro/Comm re-branded tubes from other manufacturers, some of them quite good. RCA, Tungsram,... does it say where it was made?
 
Dynaural Control Center

I had bought a part of a similar H.H. Scott branded console. Looked similar to the “Copley-203”, but in a matter of fact was quite different. But first of all I think the tube diagram of 203 does not match the presented chassis. There are 14 tubes listed on the diagram while chassis photo shows 16 tubes. And a basic evidence; a tuning indicator is a 6GX8 tube on the diagram and a typical H.H Scott mechanical device is on the photo.
My purchase have a name on a front “Dynaural Control Center”. Compare to the “203” there are more tubes in it – 18. The “Dynaural..” looks more or less like a separate tuner with preamplifier and is getting supply from power amplifier.
I was looking for any information about the unit for few years with negative result. And the “203” was the first H.H Scott product I saw which resembled the “Dynaural...”. The additional issue was the fact I received the console with mix of tubes. Just for an example. One of tube sockets was occupied by a duodiode rectifier branded “Hammond” and it looked like it should be a dual triode sat in that socket. Does anybody have any information about that “Dynaural Control Center” ? Does exist a diagram of the said console ?
 

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That dual turntable is nice one to bring back especially if you want to experience idler drive. Shame though is the head shell (sled thing) is missing. those are rare and hard to come across, nobody makes replacements for them.
A Shure 97xe is a good cart to use if you do find one.
 
nieckiepl said:
I had bought a part of a similar H.H. Scott branded console. Looked similar to the “Copley-203”, but in a matter of fact was quite different. But first of all I think the tube diagram of 203 does not match the presented chassis. There are 14 tubes listed on the diagram while chassis photo shows 16 tubes. And a basic evidence; a tuning indicator is a 6GX8 tube on the diagram and a typical H.H Scott mechanical device is on the photo.
My purchase have a name on a front “Dynaural Control Center”. Compare to the “203” there are more tubes in it – 18. The “Dynaural..” looks more or less like a separate tuner with preamplifier and is getting supply from power amplifier.
I was looking for any information about the unit for few years with negative result. And the “203” was the first H.H Scott product I saw which resembled the “Dynaural...”. The additional issue was the fact I received the console with mix of tubes. Just for an example. One of tube sockets was occupied by a duodiode rectifier branded “Hammond” and it looked like it should be a dual triode sat in that socket. Does anybody have any information about that “Dynaural Control Center” ? Does exist a diagram of the said console ?
Click to expand...

Is there another part to that thing? Nothing there looks (to my luddite eyes anyway) like a power section. That, and the Molex connector on the back, make me think that perhaps there is a separate power amp section.
 
Bluelobster said:
That dual turntable is nice one to bring back especially if you want to experience idler drive. Shame though is the head shell (sled thing) is missing. those are rare and hard to come across, nobody makes replacements for them.
A Shure 97xe is a good cart to use if you do find one.
Click to expand...

I'll find one. It ticks me off to think the sled was likely stolen at the thrift store. Everything else was in too good of shape to have been donated that way.
 
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