FU-19 (FM30, 829B) Single-Ended Tube Amp!

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jk@home

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Re: FU-19 (FM30, 829B) Single-Ended Tube Amp!
« Reply #200 on: 21 Apr 2025, 09:48 am »
So would it be good, bad or indifferent to twist the wires together that go to the tops of the main tubes? Similar to the pic shown a few pages back.Thinking about as is, could act like an antenna?

renaudrenaud

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Re: FU-19 (FM30, 829B) Single-Ended Tube Amp!
« Reply #201 on: 21 Apr 2025, 01:50 pm »
Left is the old one. Right is the new one, 6n2p ES, extended life.












FullRangeMan

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Re: FU-19 (FM30, 829B) Single-Ended Tube Amp!
« Reply #202 on: 21 Apr 2025, 02:19 pm »
So would it be good, bad or indifferent to twist the wires together that go to the tops of the main tubes? Similar to the pic shown a few pages back.Thinking about as is, could act like an antenna?
Dont mess with these wires, these wires are too short, antenna effect dont happen under 1M long.
« Last Edit: 22 Apr 2025, 05:36 am by FullRangeMan »

Jon L

Re: FU-19 (FM30, 829B) Single-Ended Tube Amp!
« Reply #203 on: 21 Apr 2025, 07:51 pm »
Left is the old one. Right is the new one, 6n2p ES, extended life.











Huh, you sure the left tube is the "old" tube?  Is your second photo of the tube box of the tube on the left or right?
Because the tube on the left (and the tube box) seems to be the Russian 6N2P-EB(EV, not ES) and the tube on right looks like the Chinese 6N2, which you can tell by the star and Chinese letters around it, which is the stock Chinese 6N2 tube that came with both of my FU19/FM30 amps.

FullRangeMan

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Re: FU-19 (FM30, 829B) Single-Ended Tube Amp!
« Reply #204 on: 22 Apr 2025, 05:43 am »

This box are from a Russian 6H2n-EB tube made by Voskhod.

jk@home

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Re: FU-19 (FM30, 829B) Single-Ended Tube Amp!
« Reply #205 on: 22 Apr 2025, 09:18 am »
Dont mess with these wires, these wires are too short, antenna effect dont happen under 1M long.

OK, thanks.
For now I have settled with using Mogami 2549 for the SE and balanced signal cables, and Supra CLassic 1.6 (15 AWG) for speaker cables. Both would qualify for C&C (cheap and cheerful) cables. This setup now is sounding wonderful, very happy with it.

FullRangeMan

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Re: FU-19 (FM30, 829B) Single-Ended Tube Amp!
« Reply #206 on: 22 Apr 2025, 03:34 pm »
OK, thanks.
For now I have settled with using Mogami 2549 for the SE and balanced signal cables, and Supra CLassic 1.6 (15 AWG) for speaker cables. Both would qualify for C&C (cheap and cheerful) cables. This setup now is sounding wonderful, very happy with it.
IMO the Supra awg 15 are too thin, try use the Supra awg 15 x 2.

renaudrenaud

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Re: FU-19 (FM30, 829B) Single-Ended Tube Amp!
« Reply #207 on: 23 Apr 2025, 05:45 am »
IMO the Supra awg 15 are too thin, try use the Supra awg 15 x 2.

Is it true even with the so low power of the amp?

FullRangeMan

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Re: FU-19 (FM30, 829B) Single-Ended Tube Amp!
« Reply #208 on: 23 Apr 2025, 06:48 am »
Is it true even with the so low power of the amp?
Yes if used as speaker cable IMO.
But in the end its all about personal taste.

jk@home

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Re: FU-19 (FM30, 829B) Single-Ended Tube Amp!
« Reply #209 on: 23 Apr 2025, 08:56 am »
Yeah I've been bouncing back and forth between the Supra wire, and Mogami 2921, which is a 14/4 cable. I feel there is a difference between the two. When I add the Heil tweeters to the speakers, plan on switching the Supra over to those. The article below is a bi-wiring receipe, but I just bundle the red/yellow and brown/orange for a higher gauge 2 conductor.

https://www.takefiveaudio.com/contents/27-mogami2921biwire



mresseguie

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Re: FU-19 (FM30, 829B) Single-Ended Tube Amp!
« Reply #210 on: 23 Apr 2025, 03:22 pm »
Left is the old one. Right is the new one, 6n2p ES, extended life.











Just for information/reference: The two Chinese characters 北京 (Beijing). Presumeably, this tube is manufactured in or near Beijing, China.


FullRangeMan

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Re: FU-19 (FM30, 829B) Single-Ended Tube Amp!
« Reply #211 on: 23 Apr 2025, 05:26 pm »
Good to know you can read Mandarim :thumb:

jk@home

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Re: FU-19 (FM30, 829B) Single-Ended Tube Amp!
« Reply #212 on: 27 Apr 2025, 01:00 pm »