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Old 22nd April 2013, 02:23 AM   #211
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Here's a finished preamp. It is burning in on my secondary system.
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Old 25th April 2013, 12:46 AM   #212
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Well, that one sold quickly...
Decided to build a couple of Aikido noval preamps with AC heaters and choke filtered PS. Will use PS-7 from TubeCAD and Hammond 158M chokes. Voltage on the plates should be around 250V. I seem to be getting a hang on building these...
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Old 10th May 2013, 02:57 AM   #213
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I am just basically documenting my own work here.

Here testing new configuration of Aikido with CLCRC power supply and 6N1P - 6N6P tubes. Voltage on the plates +270V, Rk - 360R on both tubes. Used Kiwame for Rk, Allen Bradley CC for grid stoppers, TDK CM2 as power resistors in final RC stage, Dale precision is the rest. Coupling caps - Auricap. Overspecked power transformer, Hammond 10H 100ma choke. Elevated AC heaters (JB, please put jumpers on the board for AC heater elevation)

Preamp sounds excellent, much better than with any regulated power supplies I used in the past (a lot of help from PSUD2). Also tests show that 6N6P sounds better when biased "hot".

Everything will be put in a nice chassis.
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Last edited by ClefChef; 10th May 2013 at 03:01 AM.
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Old 15th May 2013, 02:41 AM   #214
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Finished Aikido, with CLCRC PS, 128 step volume control. This one is a keeper - the best sounding of all I built so far...
I will share the build details with everyone interested.
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Old 11th August 2013, 12:36 PM   #215
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What's your final build cost for a unit Clef? Just before I dive in and try and make a kit look as good as yours..

Cheers.
Dean
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Old 11th August 2013, 01:14 PM   #216
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Let's see:
aluminum chassis - $82
power transformer - $52
transformer cover - $29
tubes - $40
Hammond choke - $24 ($19+$5 shipping)
Relay volume control - $37
3 pairs of RCA - $15
Alps pot - $14
PS-7 power supply - $19
Aikido noval PCB - $39 (+shipping)
Angela tube sockets (4) - $20
Kiwame, Allen-Bradley, TDK, and Dale resistors - $60
Auricaps (2) - $76
misc caps, resistors, wire, cable, heatshrink tubing, hardware (torx bolts) ~ $50
I also added the remote control to this preamp - $24

The raw cost of parts comes out to ~ $600. Add tools (drills, hole punches, etc.) and lots of time.
The cost of parts depends on the quality of them. You could use Russian K40-Y9 coupling caps that sound excellent and are a bit cheaper than Auricaps, dispense with remote and relay volume control, use cheaper transformer without cover. Cost of parts would go down under $450.

Last edited by ClefChef; 11th August 2013 at 01:19 PM.
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Old 11th August 2013, 02:46 PM   #217
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Nice one. Thanks for the detailed response. I'll start saving
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Old 11th August 2013, 07:28 PM   #218
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This latest build is FOR SALE! Asking $850
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Old 11th August 2013, 07:42 PM   #219
mattmcl is offline mattmcl  United States
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That's a really good deal. I spent $600 using mid grade components, and no stepped attenuator or remote control.

Can you share which attenuator (if you bought it) and remote control unit you used? I've been hesitant to do this as I was concerned the rc unit wouldn't have enough oomph to turn a stepped pot.
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Old 11th August 2013, 08:35 PM   #220
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Quote:
Originally Posted by mattmcl View Post
That's a really good deal. I spent $600 using mid grade components, and no stepped attenuator or remote control.

Can you share which attenuator (if you bought it) and remote control unit you used? I've been hesitant to do this as I was concerned the rc unit wouldn't have enough oomph to turn a stepped pot.
Look for "relay volume control" on eBay, they sell for $36-40 single ended. This relay volume module is controlled by a simple 50k pot, so any RC with 50k pot will do - I see some on eBay for $20...
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