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The diyAudio Firstwatt F6
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Old 10th June 2018, 04:57 PM   #1881
kbergsson is offline kbergsson  Iceland
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Originally Posted by silasmellor View Post
Only to occupy your hands all the more reason to keep building things...
Correct Silasmellor Im currently thinking of a chassis for M2 monoblocks and really like how the Hiraga Monsters and for example the Pioneer M22 class A from the eighties where built. More in the tube style with exposed caps and trafoboxes. I really lusted for the Hiraga amps when I was studying in Dk in the eighties. Couldnt afford the amps or the right speakers at the time and eg the Acoustas with the 8 inch Corals, which I could have built, where to thin sounding for my taste. I did assemble the Klifoth Onkens ( with the plaster egg) for a friend, they would have been great partners for the Monsters.
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Old 10th June 2018, 08:04 PM   #1882
chede is offline chede  Germany
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The diyAudio Firstwatt F6
Originally Posted by kbergsson View Post
... I tried yesterday to exchange my Aikido linestage ( ca 10-15 db gain, using 4x 6cg7 tubes) with a Slagle autoformer box ( used as my pre for many years in front of SE 300B amps). ...
You could try re-configuring your Aikido as an Aikido Cathode Follower (ACF), which mainly acts as a buffer.

I did that by pulling out the first tube, the one that provides all the gain. The only thing that I then needed to do then was connecting the two connections in the empty socket where grid and plate of the lower half of the tube would have been going with a capacitor. 220 nF to 1 µF is fine, and voltage rating must be sufficient for the full B+.

in the attached schematic, the left socket would be empty, and the capacitor would go between pins 1 and 2.
The diyAudio Firstwatt F6-aikido-wullie-pcb-jpg

Just try it ... it's an interesting alternative. It gives me enough gain in most situations (M2 into 100dB/W efficient Jericho Horns), and has about half the distortion of a regular Aikido.

Just remember that the regular Aikido is inverting, but the ACF is not ...

Best regards,
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File Type: jpg Aikido Wullie like PCB.jpg (42.5 KB, 250 views)
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Old 10th June 2018, 08:16 PM   #1883
kbergsson is offline kbergsson  Iceland
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Thanks Claas, I will try this on my Aikido.
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