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Another Newbie Who Bought a Cheap Chinese Tube Amp Kit
Another Newbie Who Bought a Cheap Chinese Tube Amp Kit
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Old 13th July 2019, 10:01 PM   #91
Lingwendil is offline Lingwendil  United States
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Honestly I would not use any electrolytic caps that come with these kits, replace them with name brand stuff, I usually try to use 105C 5000HR+ stuff in most build like this.
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Old 17th July 2019, 12:27 PM   #92
Lotus78 is offline Lotus78
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Finished product. The stock tubes sound bad. Replaced them with some inexpensive Russian tubes and the amp sounds ok. Used it for I few months and just pulled it out of my main system after buying I Peachtree Nova 150 which the little could come close to.

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Old 18th July 2019, 08:00 PM   #93
w5jag is offline w5jag  United States
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So, mine arrived a few minutes ago - the power transformer has a 110 volt primary, as depicted in most of the pictures of these things. My line normally runs around 120-123 so that will give me a bit of B+ boost.

It has straight sided power tubes, marked as Shuguang 6L6WGB, instead of the small coke bottles in the advertising picture, and a straight sided Russian rectifier. The 6N1 is Shuguang, but without the trade dress.

All the major parts look to be there - iron, punched chassis, tubes, didn't root around in the box for anything else. May or may not have a schematic, not that that matters much.

Still looks like a good deal for the $116 USD or so these are selling for.
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Old 18th July 2019, 08:06 PM   #94
Wavebourn is offline Wavebourn  United States
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Another Newbie Who Bought a Cheap Chinese Tube Amp Kit
110V 50 Hz? Not a problem for 130V 60 Hz. Chinese 6L6WGB are pretty good tubes also.
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Old 18th July 2019, 08:29 PM   #95
w5jag is offline w5jag  United States
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I hadn't thought much about the frequency, but it is a pretty good chunk of iron - probably is a 50 Hz part.

I thought I might do like you suggested in another thread - double it for high B+, use undoubled as low B+, and pull a screen voltage out of that. Maybe stick some 6146 in it.
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Old 19th July 2019, 01:51 PM   #96
Fenris is offline Fenris  United States
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So I ordered one last week. For about $115 shipped, it's not a bad deal. I'll be building it as a triode output with no global feedback and re-working most everything else as well. I'll document it in another thread, but for now, my initial impressions:

1. It's small. Real small. The length/width is about that of a sheet of paper.
2. The iron is close together. Like sharing the same mounting screws close together. I'm a bit worried about magnetic coupling, but we'll see.
3. The power transformer seems to be big enough, from initial mass estimates.
4. The sheetmetal is SHARP. I sliced open my thumb within the first minute of unboxing. Five minutes with a bastard file and some sandpaper and now it's only mildly dangerous.
5. The packaging was excellent for the price point. No bespoke foam liners (naturally), but lots of foam and thick cardboard around everything.
6. The components look to be quite value oriented. Most everything but the iron, chassis, hardware, sockets, tubes, and maybe the power switch will go into the "use, but not on something critical" spare parts bin. All the components I use will be from my massive parts stash.
7. The output transformers are small for SE. Maybe half the size of my Edcor 25w P-P transformers. So maybe 5w max in SE?
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Old 20th July 2019, 09:52 AM   #97
OldHector is offline OldHector
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How do you order one for 230v mains? Does the transformer have two primaries? The one advertised in the states was just $20 shipping to Sweden! I should ask them to stick a few bits from Digi-Key into the box too ;-)
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Old 20th July 2019, 12:48 PM   #98
w5jag is offline w5jag  United States
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The one I just received looks to have dual 110 volt / 50 Hz primaries, that I presume can be series or parallel connected as needed, so you should be OK.
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