Forums - Space Tech Lab Super Tube Rectifier Arrived!

Adamaley Verified Member Posts: 38	Re: Space Tech Lab Super Tube Rectifier Arrived! Reply #600 - 09/02/25 at 03:08:29 You won't regret it. Welcome to the club. I've placed an order for a second one for my Preamp. It's indispensable
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Tony Seasoned Member "Life without...music is inconceivable" A.Einsteln Posts: 799	Re: Space Tech Lab Super Tube Rectifier Arrived! Reply #601 - 09/02/25 at 03:51:26 Adamaley, are you still looking for a 845 to 300B adapter? If you are, let me know as I have one I could send. Tony
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Adamaley

Verified Member

Posts: 38

Re: Space Tech Lab Super Tube Rectifier Arrived!
Reply #602 - 09/04/25 at 15:15:53

Hi Tony. Thanks for the offer. I have been experimenting with 8020 tubes, and wanted to try two at the same time but only had one 845-300B adapter.

I had a bit of a light bulb moment for a workaround - I have Al's 845 - 5U4G. I also have a 5U4G to 5Z3 adapter, so I stacked them. Not ideal but it worked.

I am finding that some of the 8020s are the most resolving and transparent to the music of all tube types I've tried. They also produce a scale/envelopment beyond most of the other types I like. The only issue is a leanness to the sound, which I am trying to combat with incoming fleshier tubes for my DAC, or once my STR-1002 comes in for my preamp so I can add more meat to the bones.

I will report my tube findings once the dust has settled. I will encourage anyone with the 845-300B adapter to jump on the 8020 tube wagon - they are cheap as chips and you can't beat the clear light bulb glow they produce either. And, oh, yeah, they sound great.

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CAJames

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Re: Space Tech Lab Super Tube Rectifier Arrived!
Reply #603 - 09/04/25 at 15:39:17

Quote:

Posted by: Adamaley Posted on: Today at 07:15:53

...I will encourage anyone with the 845-300B adapter to jump on the 8020 tube wagon - they are cheap as chips and you can't beat the clear light bulb glow they produce either. And, oh, yeah, they sound great.

Grumble, grumble. I got 300B adapters with my STR-1002 but quickly decided that 300B and/or any of my conventional rectifiers didn't come close to the 10V DHTs so I sold them off. Since I'm done buying tubes (pass the candle...) this is only academically interesting to me. But it is interesting none the less. Is the top cap on the 8020 the same size as for 872A/4B32 tubes?

Quote:

I had a bit of a light bulb moment for a workaround - I have Al's 845 - 5U4G. I also have a 5U4G to 5Z3 adapter, so I stacked them.

Stacking 2 adapters is a start. How about 3?

This was an early test stacking 845 -> 300B, 300B -> 5U4 and 5U4 -> AZ1/AZ12 to try some Telefunken 4V rectifiers.

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Adamaley

Verified Member

Posts: 38

Re: Space Tech Lab Super Tube Rectifier Arrived!
Reply #604 - 09/04/25 at 15:52:21

Stacking wasn't the lightbulb moment. It was the fact that I had an old 5Z3-5U4G adapter that didn't readily scream 300b pinout to me until I fortuitously realized that it would work.

Thanks for sharing that pic though. Besides loving the look, it reminds me that I have some AD1 tubes and adapters I can try. Funny how things work.

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Bluetti AC200P (Taiko Audio Extreme Server
Lampizator Pacific DAC(Space Tech Labs STR-1002) Misho Myronov Wooden Preamp)
Ecoflow Deltra Pro Ultra powering
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Campo007 Verified Member Posts: 2	Re: Space Tech Lab Super Tube Rectifier Arrived! Reply #605 - Today at 10:58:51 Just received an email from Al saying my STR should ship this week! The unit is burning in now. :D
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