Search found 589 matches

by Beate Ritzert
Sat Sep 21, 2019 5:51 pm
Forum: Electronics
Topic: Low Impedance pickup - prototype
Replies: 20
Views: 14843

Re: Low Impedance pickup - prototype

This is a really interesting thread. I was at the namm show in '06 ( or was it '07...?) when I saw/heard the aluma-tones for the first time. Have been interested in this stuff ever since. Is the output V of your prototype comparable to a regular high inductance pickup? The one You quoted is a compe...
by Beate Ritzert
Thu Aug 29, 2019 3:56 pm
Forum: Electronics
Topic: Low Impedance pickup - prototype
Replies: 20
Views: 14843

Re: Low Impedance pickup - prototype

Just another use of that approach: hum cancellation coils. A single closed loop of thick wire (or maybe a few) and a suitable Talema AX to transform the level of the noise induced into the loop. The products of loop area times turns of the transformer must match the loop area of all windings of that...
by Beate Ritzert
Wed Aug 21, 2019 11:46 am
Forum: Electronics
Topic: Low Impedance pickup - prototype
Replies: 20
Views: 14843

Re: Low Impedance pickup - prototype

Short research - Craig Anderton "Super Tone Control" tells me nothing - this seems to be an implementation of a SVF. It'll probably need a preamp stage to raise the signal level. Keep in mind that the treble resonance has to be thoroughly damped out to linearity with any guitar pickup. Unless You wa...
by Beate Ritzert
Tue Aug 20, 2019 7:43 pm
Forum: Electronics
Topic: Low Impedance pickup - prototype
Replies: 20
Views: 14843

Re: Low Impedance pickup - prototype

The pickup demands for a microphone amplifier, both regarding sensitivity as well as input impedance - which should not be larger than 2 kOhms in oder to damp the treble resonance. The latter is important - if undamped it could harm any tweeter. In these respects these príckups are very similar to t...
by Beate Ritzert
Tue Aug 20, 2019 7:29 pm
Forum: Solid-Body and Chambered or Semi-Solid Electric Guitars and Bass Guitars
Topic: Sharkfin. Attempt on an ergonomic bass
Replies: 21
Views: 15105

Re: Sharkfin. Attempt on an ergonomic bass

Beate, I really admire what you've done here. I'm curious about the final weight. It looks to be exceptionally comfortable and well balanced. It is indeed very comfortable, especially while sitting a lot more comfortable compared to its sibling (the Primavera). And i like the fanned frets on that b...
by Beate Ritzert
Thu Jul 18, 2019 3:44 pm
Forum: Archtop Guitars and Bass Guitars
Topic: Archtop Tenor Uke
Replies: 7
Views: 4038

Re: Archtop Tenor Uke

Very beautiful!
by Beate Ritzert
Wed Jul 17, 2019 8:39 pm
Forum: Solid-Body and Chambered or Semi-Solid Electric Guitars and Bass Guitars
Topic: Sharkfin. Attempt on an ergonomic bass
Replies: 21
Views: 15105

Re: Sharkfin. Attempt on an ergonomic bass

Not quite finished - i still need to improve the setup and, moreover, i need a solution to hide the fasteing screws of two micro switches under the top - but playable. The ergonomic ideas work pretty well, especially in direct comparision to the LP Jr shaped bass which used a neck with identical pro...
by Beate Ritzert
Sat Jun 15, 2019 4:34 pm
Forum: Electronics
Topic: Wiring a Music Man type bass pickup
Replies: 8
Views: 6091

Re: Wiring a Music Man type bass pickup

Y A purist would tell you you already have 3 times too many knobs on that bass. <g> Indeed, well actually infenitesimally times too many... The right numer pot pots on such a bass is that - just a kill switch and a selector for parallel, single coil, and parallel ("alarm mode"): https://www.mimf.co...
by Beate Ritzert
Sun Jun 02, 2019 5:57 pm
Forum: Solid-Body and Chambered or Semi-Solid Electric Guitars and Bass Guitars
Topic: Good amp for electric ukulele is needed
Replies: 4
Views: 1716

Re: Good amp for electric ukulele is needed

Well, even a 5W tube amp can be really clean as long as You don't play it really loud. Or as long as You use it with a speaker of great sensitivity, which more or less means a good 12" speaker. Output transformer not too small. Which excludes all those chinese made 5 W tube amps unless they are modd...
by Beate Ritzert
Sat May 25, 2019 8:01 pm
Forum: Solid-Body and Chambered or Semi-Solid Electric Guitars and Bass Guitars
Topic: Sharkfin. Attempt on an ergonomic bass
Replies: 21
Views: 15105

Re: Sharkfin. Attempt on an ergonomic bass

Again a few steps of progress - top roughly shaped. Unfortunately my scraper was not sharpened correctly and left some scratches. I wanted to haave it done as long as i have full support of the main body. In addition the frets have been shaped. So everything is ready to contour the rest of the body ...
by Beate Ritzert
Wed May 08, 2019 6:39 am
Forum: String Instrument Repair: Practical and Political Issues
Topic: Cutting fret slots failed. And now?
Replies: 33
Views: 13431

Re: Cutting fret slots failed. And now?

Thanks.

The main reason why i did not just do it is the questions on tools and procedure for the slots on the sides, which need to be done first, see Image
by Beate Ritzert
Tue May 07, 2019 6:41 pm
Forum: String Instrument Repair: Practical and Political Issues
Topic: Cutting fret slots failed. And now?
Replies: 33
Views: 13431

Re: Cutting fret slots failed. And now?

What do you think of the following idea to hide the gap frm the back (where it is widest)? Regarding the gaps on the sides. These are much more narrow. I am considering to do a very narrow inlay of, say 1.1-1.25 mm (< 1/20 in), but i am completely unsure on the best way to cut such a slot. The cutaw...
by Beate Ritzert
Fri May 03, 2019 12:55 pm
Forum: Archtop Guitars and Bass Guitars
Topic: Bass guitar into guitar amp?
Replies: 8
Views: 4391

Re: Bass guitar into guitar amp?

It may easily be a tale. But one with a real and serious physical backgrond. It may i ndeed happen.
by Beate Ritzert
Sun Apr 28, 2019 8:48 pm
Forum: String Instrument Repair: Practical and Political Issues
Topic: Cutting fret slots failed. And now?
Replies: 33
Views: 13431

Re: Cutting fret slots failed. And now?

Well, the same neck: a nasty mistake while fitting it - the neck pocket was so tight that i did not fully see that misfit because the neck never was correctly in the pocket :-( The gap appeared to be a lot narrower as you can see from the slice of maple it dit already fit into the slot. And i should...
by Beate Ritzert
Sun Mar 31, 2019 4:37 am
Forum: Electronics
Topic: Piezo Bass Preamp
Replies: 30
Views: 13464

Re: Piezo Bass Preamp

If Your idea was right, the input impedance would in fact be 150k||470k, i.e. even less.
Please read the (readily available) theory on OpAmps before inventing You own...
by Beate Ritzert
Sat Mar 30, 2019 5:15 pm
Forum: Electronics
Topic: Piezo Bass Preamp
Replies: 30
Views: 13464

Re: Piezo Bass Preamp

I do correct You 'cause You are wrong ;-) R4 does not at all affect the input impedance, it is *solely* R1.
The ratio of R1 and R4 determines the amplification
by Beate Ritzert
Thu Mar 28, 2019 7:22 pm
Forum: Electronics
Topic: Piezo Bass Preamp
Replies: 30
Views: 13464

Re: Piezo Bass Preamp

Addition (in German), quoted from a German forum - to link it does not correspond to our rules here. Please paste the text into an online translator if You can't read German. Background is an amplifier for LoZ pickups. The recommended LT1112 is pin compatible with the TL72, less noisy (the noise of ...
by Beate Ritzert
Thu Mar 28, 2019 3:59 pm
Forum: Electronics
Topic: Piezo Bass Preamp
Replies: 30
Views: 13464

Re: Piezo Bass Preamp

There is no indication in the redcircuits paper what the input impedance is. But You can read it directly from the schematics: 150 kOhm. FAR to small for a piezo preamp. Piezos need more that 1 MOhm. Even the 3.3 Meg of the Till JFET buffer i linked is on the low side. As for the Opamps: the TL072 ...
by Beate Ritzert
Wed Mar 27, 2019 9:36 pm
Forum: Electronics
Topic: Piezo Bass Preamp
Replies: 30
Views: 13464

Re: Piezo Bass Preamp

Here a really simple solution, which works really well. With a reduced input resitance i am using with magnetic pickups as well. http://www.till.com/articles/GuitarPreamp/index.html And here something for the Jazz Bass: http://ozvalveamps.org/repairs/circuits/stomps/jfet-bass-preamp_sch21-albert-kre...
by Beate Ritzert
Fri Mar 15, 2019 9:43 pm
Forum: String Instrument Repair: Practical and Political Issues
Topic: Cutting fret slots failed. And now?
Replies: 33
Views: 13431

Re: Cutting fret slots failed. And now?

Just another question: what if such a mistake would have occured in an instrument for sale (which is not the case here)? What would the market demand / accept such repairs in new instruments (of course if the client had been told and given a suitable discount)? To me that would be a target conflict ...