2N2222A phono preamp - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

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 10th January 2010, 06:43 PM   #1
Ivey is offline Ivey  United States
diyAudio Member
 
Ivey's Avatar
 
Join Date: Jan 2010
Location: Ann Abor, Michigan
Default 2N2222A phono preamp

Thread split from Need a good phono stage design..
__________________________________________________ _________________


Phono preamps, Phono preamps.

Everyone wants a "good" phono preamp. And it must be tubes. Why..., must it be tubes, is my question.

I have been in electronics since 1952. And not once, have I a seen a great tube preamp; that did not require re-tubing.

Re-tubing a tube preamp, removes the balance and the smooth tones that was once its signature. You will spend large sums of money trying to get that sound again, that will never return. It will be close, but no cigar. Never! Again.

Why, because tubes are not made equal. The grid is the secret to its sound. And they are never made the same. Believe me..., I know. I worked at GE and Tung-Sol tube factories. And it does not matter what you do or how hard you look.

So I will tell you a great secret, one that very few know.

There is only one great phono preamp. And I designed and built it for the US Government in 1961. And it uses only three transistors. A transistor that was designed in 1956. That is still made today, for as low as 3 cent each per 100.

When I was young, I went to Bell labs, and met the people that were designing transistor chips for many other companies. They were starting to make silicon units. They gave me what they called the greatest transistor ever. They told me that thousands of different transistors will come after it, and people will over look its outstanding values, because they will misunderstand it. Or they will misunderstand its data values or they would not know how to read a transistor data sheet.

My the phone preamp used three 2N2222A. It is very, very quite.

You may being thinking, I am crazy. Yet allow me to lay some facts on you.

a. the max. noise level of a 2N2222A, is 4db. No more
b. its dc current gain is 50 to infinite, at 10na/10volts
c. its dc current gain is 75 to 325, at 1.ma/10volts. Which is much better than some of the more new transistor designs for high gain. Believe me, any thing above 375 in gain, is only better noise level. Not a better transistor. And its real Vceo is 50 volts, not 40 volts.

Once it is built, you will never want for another preamp. Because you will never lose that smooth warm tones of a 2N2222A. Will not believe your ears.

email me, if you are serious into audio, and I will send you the pcb. It is in CircuitMaker 2000 format.

Take Care

Ivey

Last edited by Ivey; 10th January 2010 at 06:54 PM. Reason: grammar
  Reply With Quote
Old 12th January 2010, 04:48 AM   #2
Ivey is offline Ivey  United States
diyAudio Member
 
Ivey's Avatar
 
Join Date: Jan 2010
Location: Ann Abor, Michigan
Default Phono Pre Amp

I am posting the drawing of the phono preamp.

But remember. Everyone.

This is a simple phono preamp. It was designed in the early 1960's. To us back then, it was something new. We kept it simple and clean.

I post this preamp not to show how smart we were. But to give people a look see as to how far we have come, from those early today in transistor technology.

Keeping it simple, is a very important issue. Us older guys remember when working on our chevys and fords was a pleasure. Because they were so simple to care for. Not like today, where you need a computer to assist you..., in telling you the door is open.

This is blast from the past. Showing that with a hand full of parts, that you can get at your local Radio Shack today. You can put a phone preamp together without pulling your hair out or wondering what all those blasted transistors are for. And do it for about $10.00 dollars.

To comment about the P-59. It was at Edwards AirBase, Calif. It flew and handled like a stone. Lockheed was given 6 to 10 months to come up with a better working design and plane. The engine that the Brits gave us was under powered and the P-59 was too heavy.

So they dropped the weight and trimmed it down and out came the P-80.

A better solution to a bad problem.

These drawing are uploaded as doc. But you first download the file. Put CircuitMaker 2000 extentions on the file. And open it up in CircuitMaker 2000. The pcb file is layout as an exploded view to let new comer to pcb layout get an idea as to how to began. But in truth, you can do as you wish.


Take Care


Ivey
Attached Files
File Type: doc 2N2222A.doc (9.4 KB, 1191 views)

Last edited by Ivey; 12th January 2010 at 05:11 AM. Reason: grammar
  Reply With Quote
Old 12th January 2010, 05:31 AM   #3
Ivey is offline Ivey  United States
diyAudio Member
 
Ivey's Avatar
 
Join Date: Jan 2010
Location: Ann Abor, Michigan
Default I mess up on the upload

I am sorry, I made an error on the upload.

This is a true doc. file that can be open in Word.

Again I am sorry.


Take Care


Ivey
Attached Files
File Type: doc Phono-01.doc (31.0 KB, 764 views)

Last edited by Ivey; 12th January 2010 at 05:34 AM. Reason: grammar
  Reply With Quote
Old 12th January 2010, 06:33 AM   #4
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Faster to see.
Attached Images
File Type: gif phono-01.gif (31.2 KB, 2939 views)
  Reply With Quote
Old 12th January 2010, 08:12 AM   #5
diyAudio Member
 
analog_sa's Avatar
 
Join Date: Aug 2002
Location: Sofia
Apart from the fact that it certainly doesn't provide accurate RIAA or cart loading isn't there an error at the input transistor base?
  Reply With Quote
Old 12th January 2010, 05:14 PM   #6
Ivey is offline Ivey  United States
diyAudio Member
 
Ivey's Avatar
 
Join Date: Jan 2010
Location: Ann Abor, Michigan
Default The Moderator is Correct

To all, I must say that I did it again. I screwed up the upload to the drawing. But I managed to work it out. I am re-posting the complete drawing.

The Phono Preamp and the LineAmp are mere simple circuits. They are not for the purpose of dazzling people with my skills or knowledge.

They are to provide a stepping stone for those who want to try out something new, different, and inexpensive. As a building block per say.

Most parts are easy to obtain, from Radio Shack, Mouser, and local Hamfest markets. With luck, it could be built (a stereo unit) for about $25.00 dollars.

You can use 120 volt transformers with a voltage doubler, for the HV.
The MJE13007, can be replaced with even another MPSA42 with a heatsink.

It may run warm. But it is a hobby. Burn it up. Start all over again.


Take Care.


Ivey
Attached Files
File Type: doc Tubes-01.doc (41.5 KB, 320 views)
  Reply With Quote
Old 12th January 2010, 05:25 PM   #7
Pano is offline Pano  United States
diyAudio Moderator
 
Pano's Avatar
 
Join Date: Oct 2004
Location: Kona, Hawaii
Blog Entries: 4
for those of you who can't open the schematic in Word.
Attached Images
File Type: gif preamp.gif (17.4 KB, 2782 views)
__________________
Big Altec Moving Sale!
  Reply With Quote
Old 12th January 2010, 06:22 PM   #8
Ivey is offline Ivey  United States
diyAudio Member
 
Ivey's Avatar
 
Join Date: Jan 2010
Location: Ann Abor, Michigan
Default Analog_sa

Thank You; I was wondering about your comment, yet when I went back to check, I had input the wrong value for R6.

R6 value is 82k, not 1k ohms

I was trying to get it out quickly and over looked the feedback RIAA correction resistor value.

I am posting the new drawing with the correction

Take Care

Ivey
Attached Files
File Type: doc phono cor.doc (31.0 KB, 415 views)
  Reply With Quote
Old 12th January 2010, 06:27 PM   #9
Ivey is offline Ivey  United States
diyAudio Member
 
Ivey's Avatar
 
Join Date: Jan 2010
Location: Ann Abor, Michigan
Default I am really getting old

On reviewing the PSU for the Phono and Line Amp, I failed to put the correct output voltage on the drawing.

It is 220to 230 dc volts. Not 12 dc volts.


Take Care


Ivey
  Reply With Quote
Old 12th January 2010, 07:02 PM   #10
Pano is offline Pano  United States
diyAudio Moderator
 
Pano's Avatar
 
Join Date: Oct 2004
Location: Kona, Hawaii
Blog Entries: 4
I wondered about that!
  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
2N2222A transistor and transisitor history ncdrawl Parts 119 19th February 2010 11:28 PM
new phono stage or old preamp with phono? flohmann Analog Line Level 2 2nd October 2008 10:51 PM
phono preamp wombil Solid State 5 21st May 2008 12:59 PM
Electret mic preamp - will phono preamp work? darthmullet Analogue Source 6 12th October 2007 08:32 AM
Phono PreAmp JTT Analogue Source 20 15th September 2004 05:24 PM


New To Site? Need Help?

All times are GMT. The time now is 07:10 AM.


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