It sounds great ! Gabriella has a beautiful voice. Jean ________________________________ De : Philip <kmg5443@...> À : kepptheremins@yahoogroups.com ...
I hope all the theremins in progress sound better than mine. I'm not 100% complete with my repair work, but that may be the best this design can do. The...
Philip; Are you talking about the circuit board version? Do tell... ... From: "Philip" <kmg5443@...> To: <kepptheremins@yahoogroups.com> Sent: Wednesday,...
Hello everybody, I'm currently working on the amp chassis. As I've redesigned the amp (one more amplification stage, and other things, anyway you will see it...
Hi Pala, thanks for the link. Unfortunately I already use this program, it can't be used to get what I need this time... But I've found it very useful for...
Jean; When I measured this upper chassis +150 vdc power supply originally, it was 14ma. However, the design has changed a bit since then, but it should still...
Mark, thank you very much ! I think it is good enough for what I need, don't bother to measure it again. As I said, I found that the resistor value didn't have...
Say Mark, While the physical dimensions of the "Mark 1" theremin coils are readily available, I was not able to find any mention of the actual coil values. So,...
Dan; If you look back a couple weeks, you'll find that I made the exact same measurements. I'm guessing you have a classic ESI "Brown Box" (named after the...
Note To Mark: Why aren't you in da woods? Note From Uncle: Leveren: Phil has been having ongoing problems with his Keppinger theremin wherein when he plays...
Philip, Very interesting advice from Uncle Howie ! My two cents : before going through all the filter thing, I would personally try to put a grid stopper (I...
Curious? How did you settle on these frequencies? Mine currently are at 215 and 465. They used to be at 192 and 425, but they've drifted since the last time I...
Mark, Well, mine is a blueish turquoise color, I also have a General Radio 1632A precision inductance bridge and a General Radio 1615A precision capacitance...
Philip; On my second day, I was in seven feet of snow, and the trail markers are 6' tall. 'Nuff said. Very unusual for this time of year, when you might see a ...
A classic! All wonderful equipment. The good ol' days. I joke about the early Tek 'scopes; instead of being rated in bandwidth, they were measured in BTU....
Dan; Okay, I found my notes. Here are the values I measured: Pitch antenna coil: 27.3 mH Volume antenna coil: 12.1 mH Pitch oscillator coil (each): 0.83 mH ...
Look at these waveforms. You can see the fundamental on the far left, but all other harmonics are way below in strength. One is scanned at 400 Hz, and the...
Hi Philip, glad to hear that the grid-stopper advice worked for you ! By the way, didn't you notice a small loss in the higher notes/harmonics of the playing...
Not really. Its more like -6 DB per octave (doubling). I did notice that the wave form was A LOT cleaner and not fuzzed up by harmonics. the calcs show the...
One more thing....Mark did say the Mark 1 was optimized for bass. I think that doing the concert mod may sacrifice a bit in sound quality. Since I don't play...
Philip; I must give credit for the 'concert tuning' aspect to Steven Hasten, who put in countless hours changing values until he got it just right. ... From:...
Philip; When all is said and done, could you please post the component values as well? I've seen a couple of changes, but I'm not sure if I'm current, ...
Wow; very nice! I listened a couple times with the volume turned up (don't ask what the neighbors think of me) and couldn't hear any birdies or chirps ...
