Ships of the Sea Museum, Savannah, GA November 6 3rd Annual Museum in the Moonlight, with Philip Neidlinger, thereminist, 7:00 – 9:00 pm, FREE Wander through...
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jrwatts4
Sep 6, 2009 5:39 pm
I'm new to the forum and in the early stages of building a Keppinger tube Theremin. I've been researching the group's files and links, info at Theremin World,...
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Mark Keppinger
thereminmaker
Sep 6, 2009 6:55 pm
Richard; Good questions. 1. If you don't have any ham radio swap meets occuring regularly in your area and don't know any ham radio operators (most have boxes...
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jrwatts4
Sep 6, 2009 7:31 pm
I reviewed the coil forms at Red Arrow Hobbies and didn't find the exact diameters specified. How critical is the inductance of these coils? Can I use the...
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Mark Keppinger
thereminmaker
Sep 6, 2009 7:37 pm
Richard; The sizes you came up with are what I used. The inductance isn't super critical, since as far as the pitch oscillators go, the difference between the...
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kmg5443
Sep 10, 2009 4:30 pm
http://shipsofthesea.org/pages/calendar Scroll Down to November 6 Philip Neidlinger KA4KOE...
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Philip
kmg5443
Oct 11, 2009 3:01 pm
Hello my friends: For those of you within 4 days drive time of Pooler, Georgia (just outside of Savannah), who want something fun to do, consider dropping by...
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greenmanhumming
Mar 4, 2010 2:12 pm
Hi I'm new to this list. I would like to build a tube theremin, and I hear that the keppinger design is one of the best. I am quite experienced at building,...
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mkepp@...
thereminmaker
Mar 4, 2010 4:31 pm
Tom; Welcome to the group! Mark Keppinger here. I'm not sure what you mean by 'fairly obscure tube choices'. The 6J5, 6SN7, 6H6, 5Y3, OD3 (VR150), and 6V6 are...
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mkepp@...
thereminmaker
Mar 4, 2010 4:34 pm
Information on the coils is widely available. Since I'm up to my eyeballs with other projects, I'm working on a deal with Kyle where he will probably end up...
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Tom Drinkwater
greenmanhumming
Mar 4, 2010 4:51 pm
I guess I'll be looking for a tubing supplier in the UK, tho if anyone has the parts and a winder and wants to make me the coils please get in touch with...
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Tom Drinkwater
greenmanhumming
Mar 4, 2010 5:03 pm
Hi, thanks for the reply! I guess I meant the 6H6 and 6J5 which are certainly not in common use these days.... at least not in equipment I have come across. I...
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mkepp@...
thereminmaker
Mar 4, 2010 5:16 pm
Tom; Oops; I didn't realize you were on the other side of the big pond. I'd check with your hobby shops that have model rocketry supplies. The phenolic body...
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Tom Drinkwater
greenmanhumming
Mar 4, 2010 5:21 pm
I guess I'm looking for more how it works info, so I can make intelligent guesses about how changing or tweaking anything will affect the circuit. for example,...
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mkepp@...
thereminmaker
Mar 4, 2010 5:46 pm
Tom; Okay, we're testing my memory here. I vaguely recall that the British version of a 6J5 is an L63. For the 6H6, you can either use a miniature 6AL5 (common...
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mkepp@...
thereminmaker
Mar 4, 2010 5:59 pm
Tom; I'd recommend an older ARRL (American Radio Relay League) handbookd. They turn up often for cheap, and the ones before 1970 or so are full of good tube...
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Tom Drinkwater
greenmanhumming
Mar 4, 2010 6:17 pm
I have a radio(tron) designers handbook. Most of it is beyond me :) But i'm sure theres lots of stuff in there on coils. but what I meant was - is the...
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Tom Drinkwater
greenmanhumming
Mar 4, 2010 6:23 pm
A US tube stockist I've used before has 6H6 and 6J5 cheap enough, but in metal envelope, is this OK? I'm thinking metal in general might be an issue for this...
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mkepp@...
thereminmaker
Mar 4, 2010 6:34 pm
Tom; Good question. Yes and no. While the inductance is the primary concern, the coil "Q" factor is also important, as well as the phyical proximity from the...
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mkepp@...
thereminmaker
Mar 4, 2010 6:58 pm
Tom; Sure; the metal envelope is the military version. It is more rugged, has better shielding (not enough to make a difference here), and is much more common,...
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Tom Drinkwater
greenmanhumming
Mar 6, 2010 1:11 pm
What speakers are people using with their keppinger theremins? Guitar style or full range?...
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Mark Keppinger
thereminmaker
Mar 6, 2010 3:37 pm
Tom; That's totally up to you. The output is a standard 8 ohm transformer. I've had good luck with mid-range speakers, but you are encouraged to experiment. ...
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glenlivet@...
glenlivet...
Mar 10, 2010 4:20 am
I'm starting on my Kepp theremin. It would be great if you would post the chassis dimensions and drill and hole dimensions....
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jrwatts4
May 6, 2010 4:33 pm
Do you still need chassis dimensions? I am currently assembling a Keppinger theremin and could take measurements and make a sketch if you're still in need....
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wham634blat043
Jun 2, 2010 5:58 pm
Was wondering if anyone in the group was skilled in converting schematics to layouts? Would like to try some experimental builds of the schematics for the two...
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mkepp@...
thereminmaker
Jun 2, 2010 6:01 pm
Ron; My 'real life job' includes doing circuit board layouts. As a matter of fact, I'm working on a couple right now. What did you have in mind? Mark ... ...
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wham634blat043
Jun 2, 2010 6:17 pm
Mark - That is excellent! I was thinking of building a tube unit on turret boards, ala Fender-type construction, and building another tube unit on PCBs. I've...
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mkepp@...
thereminmaker
Jun 2, 2010 6:34 pm
Ron; Do you mean the old brown phenolic board? I think it's classified as FR-2. I'm sure someone must still make it, or at least a fiberglass equivelant. The...
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wham634blat043
Jun 2, 2010 7:04 pm
Mark - I have some G10 (greenish-yellow) epoxy/fiberglass board that I would use. You are correct, the turrets would be pressed into holes drilled in the G10....
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mkepp@...
thereminmaker
Jun 2, 2010 7:22 pm
Ron; Ahhh, G10 / CEM3! I guess I'm giving away my age. Are the tube sockets going to be chassis mount or PC mount? Personally, I have never liked soldered-in...
