Aikido linestage Help Needed - 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 15th March 2007, 01:34 AM   #1
diyAudio Member
 
Join Date: Aug 2001
Location: USA,NorthCarolina
Default Aikido linestage Help Needed

Hello
I have two of John Broskies mono Octal PCB's and the PSU,PCB's that Bas Horneman did a group buy for, that uses the 6X5 rectifier tube. I don't know what transformer to use to get the B+ voltage of 300V and supply the heaters with the correct voltages needed. I am plan to use the 1578/6N8S tubes listed on ebay. I will use the Dale RN Series 1/2 W resistors. Are any WireWound resistors needed? I shoud still follow the parts listing for [6/12]SL7 & [6/12]SN7 listed in the Mono Octal PCB's instructions?
B+ Voltage = 300V
Heater Voltage = 6.3V/12.6V
R1,5,6,7,12,13 = 1M
R2,4 = 1K *
R3,9,10 = 300 *
R8, R11 = 390 * [Iq = 17mA]
R15 = 83.3K
R16 =100K
R17 = 0, Jumper
*High-quality resistors essential in this position.

C1 = 0.1 - 10 mF ( I don't know what value exactly to use).
C2 = Same "
C3 = " "
C4 = 0.047mF - 0.22mF "
C5 = 100 - 1KmF , 16V Electrolytic "
All capacitors ratings exceed B+ Voltage.
Sincerely,
Harry

  Reply With Quote
Old 15th March 2007, 02:34 AM   #2
diyAudio Member
 
Join Date: Nov 2002
Hi Harry,

If you have the boards that Bas made up then you will find that the resistor numbers are NOT the same as they would be for John's boards. Therefore you cannot use John's schematic to stuff the Bas board.

I will try to send a schematic for the 6N1P Aikido. You will find that the resistor numbers will be in the same position as they would be for a 6Sn7/6SN7 Aikido.

The top 6N1P tube shows a pin number 6 for the plate. The 6SN7 will have a pin 5 there.

Therefore the top tube will be 5 plate, 4 grid, and 6 cathode for the 6SN7 tube.

The bottom 6SN7 will be 2 plate, 1 grid, and 3 cathode. The tube pin out numbers will be the same for the other 6SN7 tube.
Attached Images
File Type: gif aikido 6n1p 5687 numbered.gif (10.8 KB, 489 views)
  Reply With Quote
Old 15th March 2007, 02:57 AM   #3
diyAudio Member
 
Join Date: Nov 2002
I will try to post a picture of the "Bas" power supply.

Note this is figured to give an output of around 220 volts if my memory is correct. I believe you will want to run your 6Sn7's with a 300 volt B+ supply.
Attached Images
File Type: gif aikido_psu.gif (27.1 KB, 521 views)
  Reply With Quote
Old 15th March 2007, 03:00 AM   #4
diyAudio Member
 
Join Date: Nov 2002
Harry,

You will need a larger transformer than the 125-0-125 that is pictured in the power supply schematic.

I'm not much good at working Duncan's power supply program but maybe someone that is good at it will jump in here and help out.
  Reply With Quote
Old 15th March 2007, 11:22 AM   #5
diyAudio Member
 
Join Date: Nov 2002
Quote:
I'm not much good at working Duncan's power supply program but maybe someone that is good at it will jump in here and help out.
Or maybe not
  Reply With Quote
Old 16th March 2007, 01:40 AM   #6
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
We can simulate in PSUDII if necessary, but the exact voltage here isn't terribly critical. And a good thing, too, because some assumptions you might build into the model will certainly not be correct or can change (e.g., line voltage). If the exact voltage is critical, go high and use a regulator to knock it down to where you want it. The reg doesn't need to be fancy- the whole raison d'etre of the Aikido was to null out power supply issues.

For a nominally 300V supply, figure an RMS rating of 0.65-0.7 of that and the transformer conservatively overspec'd. Don't use a toroid. Full wave bridge. Use solid state rectifiers. Conveniently, that means a 220V winding used with a C-input pi filter. If you know the current draw of the preamp, we can try a few variations in PSUD making some guesses on values and avoid particularly bad mistakes.

edit: PSUD will not simulate the hybrid silicon-tube circuit shown in your drawing.
__________________
You might be screaming "No, no, no" and all they hear is "Who wants cake?" Let me tell you something: They all do. They all want cake.- Wilford Brimley
  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
FS Aikido Octal linestage $75 nvrgdenuf Swap Meet 2 29th December 2008 08:35 PM
Aikido linestage tube choice? (again) Jolojl Tubes / Valves 2 29th November 2007 11:12 AM
Aikido 24V tube linestage Sarchi Swap Meet 2 11th October 2007 10:12 PM
Aikido Linestage Project PCB's Geek Swap Meet 2 5th October 2007 07:15 PM
12b4 vs. aikido linestage Klimon Tubes / Valves 2 14th August 2007 11:38 AM


New To Site? Need Help?

All times are GMT. The time now is 10:21 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