From Kenny Balys Sent Wed, Apr 18th 2018, 16:31
From Kenny Balys Sent Wed, Apr 18th 2018, 16:31
Thanks Sam. It looks like, from the comments I am getting, that, in the near/long run, I need to replace the bad inductor to have a stable instrument. In the short term, I am building a little CMOS oscillator on Veroboard so I can get recording. Will just have to retune constantly. The inductor in the String Performer looks like a square metal can with a turny bit recessed inside. You either have to drop the mother board or remove the top 3 keys to get to it. I like the Arp Omni inductor better as it can be screwed from the side. Still, the very inaccessibility of the master oscillator in the String Performer speaks to its stability. I mean, I never even knew it was there until it broke! On 18.04.18 15:50 , Sam Mims wrote: > The Arp Omni uses a variable inductor as part of the tuning circuit for > the oscillator; I assume the String Performer does the same. Here's a > picture of the Arp part, for whatever it's worth: > > https://syntaur.com/Items.php?Item=2729 > > Sam Mims > > Syntaur > > > > > On 4/18/2018 9:42 AM, Kenny Balys wrote: >> >> My Hohner String Performer lost tuning right at the beginning of a >> recording session yesterday :( >> >> I opened it up and the suspect part is a variable inductor: >> >> Hohner part L1= BV Nr 005837 >> >> I have tracked this part down to a company called Amidon in Germany. >> It has the following specifications: >> >> Amidon BV Nr 005837, colour code Black, Green, Brown, 5 MHz response, >> L = 19.6 uH, Q=120 at 1MHz, Anschluß an Stift A:5 E:4, 27 Euros price >> >> Neato. I don't understand any of this. >> >> If I want to get going now, can I not just bang together a 2MHz >> oscillator with CMOS gates? >> >> If anyone understands these things, why would a master oscillator be >> inductor based? What benefit is it? >> >> This thing feeds the 50240 Top Octave divider. >> >> I checked my Crumar and it's master oscillator also sports an inductor. >> >> The old PAIA stuff seems to mostly use CMOS gate based master >> oscillators so at least there is >> >> So where is the question? >> >> Ok.... has anyone replaced an inductor based master oscillator with a >> CMOS gate based one on a top octave divider based synth. I am shortly >> to do just that (as a band aid)... is this nuts? >