L0rdGwyn's DIY Audio
Oct 21, 2023 at 9:50 AM Post #6,421 of 6,808
In regards to the LED biasing for these amps, I'll add that I haven't totally ruled out a more typical cathode bias. In the past, my electrolytic capacitor phobia would have made this a hard no I unless I was forced to do it by the needs of the design. That was the case with Aegis, so I did a big electrolytic shootout and was blown away by the Jupiter Cosmos electrolytics. So, I should give them a fair shake and A-B test against the LED bias in these amplifiers because I really think they are that good.
 
Oct 21, 2023 at 10:25 AM Post #6,424 of 6,808
You just need to feed this with some electricity to get a nice night lamp.

1697898327385.jpeg
 
Oct 21, 2023 at 10:31 AM Post #6,425 of 6,808
Looks great Keenan.

Great choice of the paracord, I thought those bright and loud colors would not give the amp the classy look that it deserves. Just my opinion of course.
 
Oct 21, 2023 at 10:36 AM Post #6,426 of 6,808
Looks great Keenan.

Great choice of the paracord, I thought those bright and loud colors would not give the amp the classy look that it deserves. Just my opinion of course.

Thanks Joe, yeah I sorta knew when I bought the set the Zebra was the one, but wanted to see some other patterns in person before making the decision. In the end, classy is best!
 
Oct 22, 2023 at 8:44 AM Post #6,428 of 6,808
Finished the HY69 output switch, 1000x more efficient after a full night's sleep.

PXL_20231021_120755704-2.jpg

I've decided I am going to go with the Zebra paracord, think it looks pretty classy, has a nice subtle sheen to it too.

PXL_20231021_121230376-2.jpg

PXL_20231021_121735452-2.jpg
It does look rather like a British electric kettle lead…
 
Oct 22, 2023 at 8:51 AM Post #6,429 of 6,808
It does look rather like a British electric kettle lead…
Or... like the lead from a Hot Iron my mother used to have 🤣

I still think its the right choice for the tube amp though 👍🏻
 
Oct 22, 2023 at 8:58 AM Post #6,430 of 6,808
Finished the HY69 output switch, 1000x more efficient after a full night's sleep.

PXL_20231021_120755704-2.jpg

I've decided I am going to go with the Zebra paracord, think it looks pretty classy, has a nice subtle sheen to it too.

PXL_20231021_121230376-2.jpg

PXL_20231021_121735452-2.jpg

Wow, that wiring looks really neat. If you have time, could you help me with this?

2402-point-to-point-wiring-jpg.155201


(Just kidding, that's not my mess).
 
Oct 22, 2023 at 9:06 AM Post #6,431 of 6,808
Wow, that wiring looks really neat. If you have time, could you help me with this?

2402-point-to-point-wiring-jpg.155201


(Just kidding, that's not my mess).

That reminds me of the inside of the tube radio I restored, an absolute rats' nest! I try to keep my point-to-point wiring nice and neat :)
 
Oct 22, 2023 at 9:09 AM Post #6,432 of 6,808
Here's my chicken scratch wiring diagram, why doing this switch took so freaking long. Four secondaries, eight leads per channel that need to be wired in different configurations of series and parallel for the three different impedances.

PXL_20231021_120723194.MP.jpg

At this point, I've done just about everything I can to prepare for these builds, nothing really to do now but get through the work week and hopefully get started next weekend.
 
Oct 22, 2023 at 10:19 AM Post #6,433 of 6,808
Here's my chicken scratch wiring diagram, why doing this switch took so freaking long. Four secondaries, eight leads per channel that need to be wired in different configurations of series and parallel for the three different impedances.

PXL_20231021_120723194.MP.jpg

At this point, I've done just about everything I can to prepare for these builds, nothing really to do now but get through the work week and hopefully get started next weekend.

Straightforward in principle, but a hassle in real life.
 
Oct 24, 2023 at 10:14 AM Post #6,434 of 6,808
2A3 amplifier chassis is shipped and arriving Thursday! I have Friday off, so will get started first thing in the morning :) given the prep work I've done, not outside the realm of possibility of finishing it in one sitting, if not two at the most assuming no surprises of course.
 

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