jarthel
500+ Head-Fier
- Joined
- Dec 31, 2001
- Posts
- 784
- Likes
- 10
aikido (www.tubecad.com) is a design by John Broskie. He sells the PCBs as well.
It is a linestage design but can be converted to headphone amp (http://www.tubecad.com/2006/04/blog0062.htm)
Several people have built the linestage or headphone amp versions and have great results.
The power supply is a simple full-wave rectifier with choke input filter. (LC only) which is then fed to a voltage regulator design found in the RCA Designer's handbook (chap33 figure 33.14: http://img240.imageshack.us/my.php?i...re33147hl.gif)
================================
parts list:
from glass-ware.com
aikido PCB (very high quality. 2x to 2.5 thicker than normal PCB)
============================
from partsconnexion
resistors in the signal path: kiwame 2W
non-essential resistors in the amp: holco/PRP 1/2W
high wattage resistors: mills 5W and 12W varieties
other resistors: holco/PRP 1W
non-essential caps: solen
various tube sockets: 7, 8 and 9 pins
6H30: output tubes on the amp
terminal block: I need this since the power supply will be P2P.
chassis wire: DH Labs
female RCA: cardas
============
from Ebay
(all tubes are NOS)
rectifier tubes: 5U4GB, 5V4G, 5AS4, 5R4YG
pass tubes: 6NS5 russian equivalent to 6AS7G. readings from AA seems the russian 6AS7 are better than the Western versions.
error amplifier tubes: 6SL7GT
voltage reference tube: 5751A
6CG7: input tubes on the amp
output caps: 100uF 370VAC ASC motor runs (metallized polypro in oil)
bypass output caps: russian PIO and russian teflons
power supply cap: 100uF 370VAC ASC motor runs (metallized polypro in oil)
======================
from vt4c.com (HK)
main transformer: rcore if it's too noisy or build quality is poor, might have to get a potted transformer from "silk" in thailand which should be available in 2 months time.)
chassis: aluminum in black. It should look like this http://www.thlaudio.com/image/miscIM...e-PRAL-1cB.jpg
silver solder (from japan)
=================
from THLaudio.com (taiwan) (had good experience with them before but my recent communication with them is just horrible. replies take too long and sometimes unanswered)
choke: James audio
tuning knob: http://www.thlaudio.com/image/knobs/...o-r5025-45.jpg
========================
from Diyfidelity.com.au
attenuator: 100K ladder (diyfidelity.com.au). thinking of getting a proper elma ladder switch (the ones designed for audio. not telling where since stock is very low.
but I want to see the quality of the cheap switch first. it may be good enough. I have paid an extra $10 AUD to get matched resistors.
======================
from RS Compoents (local branch) (haven't ordered these yet since I need to know what stuff are missing so I can order them all at once. I want to save on postage)
secondary transformer: 75VA 2x 0-9 4.17A) for the amp tubes heaters
hex spacers that are threaded on the inside
several Rubycon caps for the heater supply
=======================
from Farnell (local branch)
headphone jack
fuse socket
power switch
====================
from sidewindercomputers.com
cheap IEC sockets with filters! (well at least cheaper that can be had locally)
It is a linestage design but can be converted to headphone amp (http://www.tubecad.com/2006/04/blog0062.htm)
Several people have built the linestage or headphone amp versions and have great results.
The power supply is a simple full-wave rectifier with choke input filter. (LC only) which is then fed to a voltage regulator design found in the RCA Designer's handbook (chap33 figure 33.14: http://img240.imageshack.us/my.php?i...re33147hl.gif)
================================
parts list:
from glass-ware.com
aikido PCB (very high quality. 2x to 2.5 thicker than normal PCB)
============================
from partsconnexion
resistors in the signal path: kiwame 2W
non-essential resistors in the amp: holco/PRP 1/2W
high wattage resistors: mills 5W and 12W varieties
other resistors: holco/PRP 1W
non-essential caps: solen
various tube sockets: 7, 8 and 9 pins
6H30: output tubes on the amp
terminal block: I need this since the power supply will be P2P.
chassis wire: DH Labs
female RCA: cardas
============
from Ebay
(all tubes are NOS)
rectifier tubes: 5U4GB, 5V4G, 5AS4, 5R4YG
pass tubes: 6NS5 russian equivalent to 6AS7G. readings from AA seems the russian 6AS7 are better than the Western versions.
error amplifier tubes: 6SL7GT
voltage reference tube: 5751A
6CG7: input tubes on the amp
output caps: 100uF 370VAC ASC motor runs (metallized polypro in oil)
bypass output caps: russian PIO and russian teflons
power supply cap: 100uF 370VAC ASC motor runs (metallized polypro in oil)
======================
from vt4c.com (HK)
main transformer: rcore if it's too noisy or build quality is poor, might have to get a potted transformer from "silk" in thailand which should be available in 2 months time.)
chassis: aluminum in black. It should look like this http://www.thlaudio.com/image/miscIM...e-PRAL-1cB.jpg
silver solder (from japan)
=================
from THLaudio.com (taiwan) (had good experience with them before but my recent communication with them is just horrible. replies take too long and sometimes unanswered)
choke: James audio
tuning knob: http://www.thlaudio.com/image/knobs/...o-r5025-45.jpg
========================
from Diyfidelity.com.au
attenuator: 100K ladder (diyfidelity.com.au). thinking of getting a proper elma ladder switch (the ones designed for audio. not telling where since stock is very low.
======================
from RS Compoents (local branch) (haven't ordered these yet since I need to know what stuff are missing so I can order them all at once. I want to save on postage)
secondary transformer: 75VA 2x 0-9 4.17A) for the amp tubes heaters
hex spacers that are threaded on the inside
several Rubycon caps for the heater supply
=======================
from Farnell (local branch)
headphone jack
fuse socket
power switch
====================
from sidewindercomputers.com
cheap IEC sockets with filters! (well at least cheaper that can be had locally)