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Wayne's BA 2018 linestage
Wayne's BA 2018 linestage
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Old 8th April 2021, 06:54 AM   #2311
andynor is offline andynor  Norway
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Join Date: Jul 2020
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Exojam: Mr. Hui has ensured me 20k works well with SS gear upstream. I went for that, but haven’t tried it yet. I see others say the same earlier in this thread, that 20k-ish is fine, but that higher can work too. I ordered both 20 and 50, so we’ll see what works best.

Leeuwarden: can’t remember the exact voltage for a B1, but is it not around 24 volts like Dirk uses? Wayne has said (if I remember correctly) that 29v is OK too in this thread, parts are rated a lot higher than that.

Here are some in-progress photos. Next move is to mount and solder the ground loop breaker, seen in the pics near chassis ground.

As said my latest work had been finishing the front and back panel. Also note the red and blue LED on the front. When I switch the rails off, the red light turns on for standby. When I switch them on, the red light turns off and the blue LED lights up. Pretty neat imho. Don’t quite like the look of colored LED lenses on the front, ideal would be LEDs that turn dark/colourless when off instead of native color. Looks kinda like an arcade machine, but who cares for now.

Note that the filtered AC inlet is connected straight to PSU without switch, and is fused after the transformer, with the jumper right after which I have chosen to connect a switch to mounted on the faceplate. I have an extra switch and an external fuse that I consider adding later, but for now this works quite smoothly.

Not entirely happy with the metal work, it was a mess, but think I managed to cover up most of the errors

Regards,
Andy
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Last edited by andynor; 8th April 2021 at 07:10 AM.
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Old 8th April 2021, 07:54 AM   #2312
Leeuwarden is offline Leeuwarden  Netherlands
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Thanks everyone.

Quote:
Leeuwarden: can’t remember the exact voltage for a B1, but is it not around 24 volts like Dirk uses? Wayne has said (if I remember correctly) that 29v is OK too in this thread, parts are rated a lot higher than that.
KB1 is 24VDC but +/- and not +/0/-. I will drop Gaz a mail to see if he has any pcb's left for the power supply.
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Old 8th April 2021, 07:58 AM   #2313
andynor is offline andynor  Norway
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I see.

Gaz’s nick here is Gaz2613.

Also see 6L6s post 1291 in this thread. He has tested several PSUs with the WLS
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Old 8th April 2021, 08:24 AM   #2314
Leeuwarden is offline Leeuwarden  Netherlands
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Thanks again. Gaz his PSU looks good for me.

Off topic: are you from the neighbourhood of Bodø?
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Old 8th April 2021, 08:26 AM   #2315
andynor is offline andynor  Norway
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Not far from it, but live in the South now. Have you travelled there?
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Old 8th April 2021, 08:36 AM   #2316
Leeuwarden is offline Leeuwarden  Netherlands
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This is really off topic

No I have not been there. It is on my bucket list. My wife and I would like to travel through Norway from Bodø down to the south one day. Bodø because they have a airworthy F-104D Starfighter over there and maybe they would allow me to visit it (They are not flying it because problems with the ejection seats). Being an aircraft spotter I grew up with lot's of Starfighters because I live near an military base in Leeuwarden, The Netherlands. Starfighters are like flying dinosaurs. The Norwegian Starfighter visited Leeuwarden in 2018. Luckily I was able to see, and hear, it. Never thought that it would make me emotional to see one flying after some 35 years

Picture I made on that occasion: 2018-06-11 637 CF-104D NorAF | Jan van der Wal | Flickr
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Old 8th April 2021, 08:47 AM   #2317
andynor is offline andynor  Norway
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Fantastic!

Quick tip: except for the Starfighter and the Air traffic museum, not much to see in Bodø, imho. But it is a great starting point to experience some of the best of the country. Fly to Bodø, take the ferry or Hurtigrute to the Lofoten Islands. Spend time there, walk, climb, rent a kayak, party, dive. You name it. You will not want to leave.

Completely off topic, sorry guys.
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Old 9th April 2021, 08:27 AM   #2318
Leeuwarden is offline Leeuwarden  Netherlands
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Quote:
You will not want to leave.
That is what worries me
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Old 10th April 2021, 06:15 AM   #2319
andynor is offline andynor  Norway
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Hi, guys!

So, after some nervewrecking behaviour yesterday, hopefully caused by isoprop residue under the connection blocks, I woke up to a very, very stable one channel WLS today.

Offset at cold was 27mv, slowly and steadily declining to 2mv within 5 minutes, and then settling around 0,1-0,4mv after 20-30 minutes.

Up and running now, promising. Very very happy with the sound! A true improvement over purely resistive non-preamp solution I had before. Need second channel for final judgement, but very transparent, liquid and no harshness.

Still keeping a close eye on it, a bit worried yesterdays behaviour will repeat itself. But seems very stable, and for now i attribute the behaviour to isoprop residue which I identified after the strange behaviour.

I was about to give up yesterday, now my hopes are up again. Once Myleftears donation arrives in the post, I’ll try the other channel too. It has gone through some rough, as Mr. Daddypants is always too tired and too fast for his own good when connecting wires... ehemmm...

Btw, funny thing and an interesting ovservation: I knew high offset could cause hum. Well, it sure does. Yesterday I observed this as the offset went apeshit. Completely silent now. The residual noise is from my poweramp, which is quite low btw.

Still, will prolly put in some shielded wires and add a small cap and resistor on the ground loop breaker, and maybe add a gnd bus. We will see if it is needed or not.

I attached some pics showing the preliminary result and offset measurements (very stable).

Have a good weekend guys, thanks to all of you! A special thanks go out to 6L6, Wayne, Dirk, Dennis Mr. FAB Hui, David (Myleftear) and Russel. And to all good experiences read in this thread! Hope I did not forget anyone.

Regards,
Andreas
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Last edited by andynor; 10th April 2021 at 06:24 AM.
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Old 10th April 2021, 08:03 AM   #2320
cubicincher is offline cubicincher  Germany
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Default to Andynor #2319

Good morning Andreas,


that looks excellent! Enjoy the sound


If the Fluke shows the DCoffset - supergood!


Greets
Dirk
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