Need a good phono stage design.. - Page 2 - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 12th January 2010, 05:18 PM   #11
Pano is offline Pano  United States
diyAudio Moderator
 
Pano's Avatar
 
Join Date: Oct 2004
Location: Kona, Hawaii
Blog Entries: 4
Posts about transistor history moved to: 2N2222A transistor and transisitor history
Transistor preamp by IVey moved to new thread: http://www.diyaudio.com/forums/analo...no-preamp.html
  Reply With Quote
Old 13th January 2010, 03:27 AM   #12
ncdrawl is offline ncdrawl  United States
diyAudio Member
 
Join Date: Oct 2008
thanks to everyone. I really, really appreciate it.
  Reply With Quote
Old 13th January 2010, 03:49 AM   #13
sonidos is offline sonidos  United States
Libertador de la Música
diyAudio Member
 
sonidos's Avatar
 
Join Date: Jul 2007
Location: Round Rock, TX
I'm like a broken record. Thanks again. This is definitely on my list. I see the parts are commonly in stock at Mouser. That's a first!!!
  Reply With Quote
Old 14th January 2010, 03:30 AM   #14
Ivey is offline Ivey  United States
diyAudio Member
 
Ivey's Avatar
 
Join Date: Jan 2010
Location: Ann Abor, Michigan
Default Panomanic: Mr. Moderator

I joined this forum because, one of my desires was to Start a thread on building Moscode styles of power amplifiers, and to share all that information with those persons interested in being a part of that thread.

But when I tried, you directed me to threads that I felt and discovered, did not truly cover the subject, nor address the subject in its realm.

The Aikido thread dealt solely with it, not moscode styles of amplifiers.

I have schematics and diagrams to nearly every Futterman OTL and Moscode amplifier. Believe or it not, they were sent to me in 1986 by George Kaye, when I moonlighted at Counterpont Electronics in Carlsbad, Ca. We serviced a lot of various HiFI equipment there as well. I also have the Counterpoint items. Somethings, I managed to lose, or loaned out and can not remember who I gave them too.

Anyway, on the "Moscode with a thump" thread, I left a message for George Kaye, but he never came back or got back to me.

I think, he thinks that if he do not answer, people will think that I am trying to act important or that I think I got one up on everyone else.

Far from it. I just want to ask him if he will give me permission to post the stuff on the forum. Because I learned that he is still making Moscodes. And he may not not like it. And I want him as a friend, not a foe.

I am aware that I can contact him in private.Yet I want this to be public, when he tells me yes or no.

I want there to be no doubts, in the forums position, the actions that I take.

I have other designs, that I can start off with, but I would like to expose all the different topologies, on the hybrid subject. If you allow me to open this thread.

I await your reply Sir.

Take Care

Ivey
  Reply With Quote
Old 14th January 2010, 05:16 AM   #15
mlloyd1 is offline mlloyd1  United States
diyAudio Member
 
mlloyd1's Avatar
 
Join Date: Feb 2001
Location: illinois
ivey, you confused me for a moment and then i see: i was referring the power supply in posts #27 and #28; i think you are referring to your bipolar transistor riaa preamp in posts #12 and #13?

so, for the power supply circuit from posts #27 and #28, shown below, is a resistor missing?

thanks
mlloyd1

Quote:
Originally Posted by Ivey View Post
No Sir, the 82k provides base bias for Q2, through the feedback loop. The 680 ohm resistor, 1k resistor, the 47uf/50 provides reference for the zener.

the zener is used to provide reference to Q2's gain section, because you have two feedback loops to that section. The RIAA and the negative feedback loop of the 82k resistor.

If the reference voltage is lost, the unit could go into oscillation. When current demands are present.

I have played the phono amp without the zener, and it sounds muddy. With it, it is sweet and warm for a ss unit.

Take Care

Ivey
Attached Images
File Type: jpg ivey1cap_mult.jpg (25.9 KB, 453 views)
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Cary Audio Design SLP-30 with separate LPP-1 Phono stage nelsondog Swap Meet 2 2nd November 2009 06:41 PM
DIY phono to replace roksan phono stage seroxatmad Analog Line Level 6 14th December 2008 06:46 PM
new phono stage or old preamp with phono? flohmann Analog Line Level 2 2nd October 2008 10:51 PM
Should I replace Scott 222C phono stage with Claret phono stage? Bing Yang Analogue Source 0 22nd August 2005 07:41 AM
Audion sterling phono stage - a good base for future upgrades? RobWells Tubes / Valves 9 9th April 2004 12:05 AM


New To Site? Need Help?

All times are GMT. The time now is 08:43 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2