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Newbie, please be gentle [message #9259]

Fri, 22 February 2008 23:41

tsprad
Messages: 9
Registered: February 2008
Location: Dallas Texas

Junior Member

Last Monday I bought a K200 head off craigslist for $100. It's missing one knob and the nameplate, and one channel doesn't work, but the reverb channel works. He gave me a set of schematics with it. Date codes on the components suggest it was made in 1968.

So I'm warning you all that I'm going to be pestering you for information and parts sources. First question: are there any hi-res pictures of these things out on the web that I could compare mine to?

Thanx in advance.

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Re: Newbie, please be gentle [message #9260 is a reply to message #9259]

Sat, 23 February 2008 11:02

LesS
Messages: 478
Registered: December 2002

Senior Member

Hi - welcome to the site.
If it has five mounting bolts (look at the bottom of the amp) it is a K200A. If it has four mounting bolts, it is a K200B.

For more info, search this website for K200

I don't know of any hi res pictures, but you can find some pictures in the Literature section.
-Les S

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Re: Newbie, please be gentle [message #9261 is a reply to message #9259]

Sat, 23 February 2008 14:23

tsprad
Messages: 9
Registered: February 2008
Location: Dallas Texas

Junior Member

Thanks! I've figured out that it's the one that RickV described in msg#8907 last September.

Tell me, is it considered blasphemy to replace the original power cord with a shorter, grounded one? Would that make a difference to noise? Or to safety?

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Re: Newbie, please be gentle [message #9262 is a reply to message #9261]

Sat, 23 February 2008 15:17

LesS
Messages: 478
Registered: December 2002

Senior Member

If you were going to put it in a museum, I am sure that somebody would say don't do it.

But if you are going to use the amp, I would say change it.
Sometimes a 3 prong cord makes it quieter, sometimes it doesn't.
But it will definitely make it safer.

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Re: Newbie, please be gentle [message #9264 is a reply to message #9259]

Mon, 25 February 2008 06:29

stevem
Messages: 4775
Registered: June 2004
Location: NY

Senior Member

What do you mean by its missing the name plate, do you mean the whole plexiglass labled faceplate?

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Re: Newbie, please be gentle [message #9265 is a reply to message #9264]

Mon, 25 February 2008 21:22

tsprad
Messages: 9
Registered: February 2008
Location: Dallas Texas

Junior Member

No, the front is fine (missing one knob), but there's no serial number or power rating tag. There's at least one extra pop rivet that isn't holding anything, and some extra holes that look like they may have held something to wind up the power cord on.

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Re: Newbie, please be gentle [message #9266 is a reply to message #9259]

Tue, 26 February 2008 00:17

tsprad
Messages: 9
Registered: February 2008
Location: Dallas Texas

Junior Member

Well, I've got both channels working now, and I installed a NEMA power connector so it now has a removable, grounded power cord.

The problem with the dead channel was that both the PNP and NPN transistors on the input were blown. I used a 2N4401A and a 2N3638A. It still has a bit of hiss, but I'm pleased with the progress.

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Re: Newbie, please be gentle [message #9267 is a reply to message #9259]

Tue, 26 February 2008 06:13

stevem
Messages: 4775
Registered: June 2004
Location: NY

Senior Member

One of my 200 heads is like yours with rivited on serial number plate missing, which is usally a sign that the head was stollen from someone at some point and then sold.

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Re: Newbie, please be gentle [message #9271 is a reply to message #9267]

Wed, 27 February 2008 22:31

tsprad
Messages: 9
Registered: February 2008
Location: Dallas Texas

Junior Member

Yeah, I kinda figured that, that it was stolen at some time in the last forty years. It would make an interesting story if I could find out when, where, and from whom, but the chance of that is approximately zero.

Provenance, like the power cord, would be important if I was putting it in a museum. Rolling Eyes

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