Search found 18 matches
- Tue Dec 10, 2019 6:12 pm
- Forum: Pro Audio Design
- Topic: MEP-250 Bridged-T equalizer
- Replies: 14
- Views: 11500
Re: MEP-250 Bridged-T equalizer
In the Sontec circuit C25's value is 33mfd, 6vdc. The values for all 5 filter frequencies are listed ln the lower right hand corner of the schematic.
- Wed Nov 27, 2019 5:08 pm
- Forum: Pro Audio Design
- Topic: Benchmark Mic Preamp from 1984 - Active Preamp History
- Replies: 39
- Views: 76197
Re: Benchmark Mic Preamp from 1984 - Active Preamp History
Sorry Wayne: I had forgotten I was on the wrong forum. It can be found on <Groupdiy.com> Look at the technical forum for Neotek, it is either the last or next to last post. By carefully matching the resistors around the discrete transistors on the front end; the CMRR approaches 100 db. I used 5% car...
- Sun Nov 24, 2019 10:41 pm
- Forum: Pro Audio Design
- Topic: Benchmark Mic Preamp from 1984 - Active Preamp History
- Replies: 39
- Views: 76197
Re: Benchmark Mic Preamp from 1984 - Active Preamp History
Paul Buff brought out his Transamp around 1975. In 1977 I was service mgr. for the Nashville MCI dealer. I met with Paul at Quadraphonic Studio; where we installed a Transamp in place of one summing amplifier, as a test toward improving the noise figure in the MCI 500 series console. It did provide ...
- Tue Mar 05, 2019 7:16 am
- Forum: Pro Audio Design
- Topic: Flat Phono Preamp Based on John's P10 and 2SK389
- Replies: 248
- Views: 311793
Re: Flat Phono Preamp Based on John's P10 and 2SK389
No Wayne: The 103R cartridge sees a resistive load of 1.6k. As moving coil cartridges are almost universally flat in their response it makes little sense to try & load it with a low resistance. The 1.6k is made up of 2ea, 802 ohm 1/4w metal foils that also provide the necessary ground reference need...
- Mon Feb 11, 2019 3:49 pm
- Forum: Test, Measurement and Repair
- Topic: Heathkit IM-5238 AC Voltmeter Repair
- Replies: 2
- Views: 4464
Re: Heathkit IM-5238 AC Voltmeter Repair
I have a pair of these I built in 1978; when I went into studio equipment repair in Nashville. i have never had a problem with them other than a sticking meter movement. The meters were made by Dixon & I was able to find a replacement at Sky Craft in Orlando. Simply swapped scales & 8nstalled it. I ...
- Wed Jun 20, 2018 5:21 pm
- Forum: Pro Audio Design
- Topic: Flat Phono Preamp Based on John's P10 and 2SK389
- Replies: 248
- Views: 311793
Re: Flat Phono Preamp Based on John's P10 and 2SK389
Yes Wayne it is the Preamp that Joe Neil did the pcb layout. The 103R is not retipped it is a slightly better cartridge. Some of the users that use mike xfmrs. for stepup claim it is as good as any in the up to $1000- range. I had talked to an applications engr. at That & designed a low Z resistive ...
- Mon Jun 18, 2018 10:23 pm
- Forum: Pro Audio Design
- Topic: Flat Phono Preamp Based on John's P10 and 2SK389
- Replies: 248
- Views: 311793
Re: Flat Phono Preamp Based on John's P10 and 2SK389
Hi Wayne: Thought I would jump in with my two cents. I designed my own moving coil phono preamp, using either That 1510 or AD SSM2019 mike pres. for the balanced input. I based the design around Denons 103R M/C cartridge. The preamp gain is set for 1000 times; as the output from the 103R is 280 micr...
- Thu May 31, 2018 1:20 pm
- Forum: Pro Audio Design
- Topic: A new way to produce lettered front panels
- Replies: 3
- Views: 3181
Re: A new way to produce lettered front panels
For my initial front panel overlay, I used MS Word to print the lettering; also had to figure the placement of the controls. Then used a program named "Zamzar" to convert the file to one accepted by the sign shop. Now I am doing each control separately using 1. print, 2. cut & paste. Next take to th...
- Wed May 30, 2018 4:12 pm
- Forum: Pro Audio Design
- Topic: A new way to produce lettered front panels
- Replies: 3
- Views: 3181
A new way to produce lettered front panels
My local sign shop in the Tampa Bay area, introduced me to a company by the name of "Rowmark". They produce plastic sign material in both 1/32" & 1/16" thickness. The material comes in many different colors & is laser engraveable. Wayne asked me to share this method after seeing the results. You can...
- Thu May 24, 2018 5:36 pm
- Forum: The Peabody Lounge
- Topic: RIP Joe Neil
- Replies: 13
- Views: 7964
Re: RIP Joe Neil
I am stunned! I first met Joe in Feb. 1978. He was chief engineer at Bob Richardsons studio, just off I75 in Atlanta. I was service mgr. for the MCI Nashville dealer & was there to tune the eq on the control room monitors. We hit it off right from the start. We rekindled our friendship 2 yrs. ago. J...