Tube Rolling w/Crack

[monsterdonkey]

I recently bought one of these 6N13S tubes from this vendor. It took a long time to arrive in Canada but it was well packaged for shipping. No tube box.

https://www.ebay.com/itm/6N13S-6AS7G-ECC230-SVETLANA-Tube-Double-Triode-NOS-USSR-Lot-1pc-/273312455235


I had an interesting issue. I plugged it in and listened for a few hours, then I went and had dinner, leaving it turned on. When I got back to it an hour or so later there was a light buzz I hadn’t noticed before. Oh well, I thought. Tube rolling is teaching me that they can’t all be winners.
Tonight I plugged it in and didn’t hear the noise until after about a half hour. My TS/Chatham 2399 is microphonic when tapped so I decided to tap on this one to see what other noises it might have. Lo the noise immediately stopped! (Also not microphonic)


I’d read on some page somewhere that tube nose can sometimes be caused by little bits of manufacturing stuff stuck somewhere inside the tube where they shouldn’t be, and a few taps could dislodge a flake of material and cure the buzz. I tried it on an unusable modern 12AU7.. some really hard taps, but nothing happened. This tap was unintended for that purpose, but it worked. At least for the moment. We’ll see as the tube continues to break in. I might be crazy and it’s just something like the tube pins should have been cleaned first..


I guess it doesn’t read as a shining endorsement for the Winged C, but it actually is. Cheap, beautiful, and sounds great.

[ChetJettison]

I recently bought one of these 6N13S tubes from this vendor.

I also just purchased the same tube from the same vendor! I look forward to hearing it. Thanks for your feedback, I'll be curious to see if any similar issue occurs with the one I ordered.

[cddc]

I recently bought one of these 6N13S tubes from this vendor. It took a long time to arrive in Canada but it was well packaged for shipping. No tube box.

https://www.ebay.com/itm/6N13S-6AS7G-ECC230-SVETLANA-Tube-Double-Triode-NOS-USSR-Lot-1pc-/273312455235


I had an interesting issue. I plugged it in and listened for a few hours, then I went and had dinner, leaving it turned on. When I got back to it an hour or so later there was a light buzz I hadn’t noticed before. Oh well, I thought. Tube rolling is teaching me that they can’t all be winners.
Tonight I plugged it in and didn’t hear the noise until after about a half hour. My TS/Chatham 2399 is microphonic when tapped so I decided to tap on this one to see what other noises it might have. Lo the noise immediately stopped! (Also not microphonic)


I’d read on some page somewhere that tube nose can sometimes be caused by little bits of manufacturing stuff stuck somewhere inside the tube where they shouldn’t be, and a few taps could dislodge a flake of material and cure the buzz. I tried it on an unusable modern 12AU7.. some really hard taps, but nothing happened. This tap was unintended for that purpose, but it worked. At least for the moment. We’ll see as the tube continues to break in. I might be crazy and it’s just something like the tube pins should have been cleaned first..


I guess it doesn’t read as a shining endorsement for the Winged C, but it actually is. Cheap, beautiful, and sounds great.

It might be a little bit unlucky to have noise issue. I got several 6H13C's and none of them had the noise issue. Hopefully tapping will resolve the issue, but be careful, do not tap the tube too hard as it will possibly knock off some cathode coating and create more problems.

Sometimes dirty / oxidized pins can also cause noise issues. So make sure you clean the pins before plug-in.

I agree with your assessment, 6H13C (aka Winged C) is cheap, beautiful , and sounds great, much better than the crappy muddy sounding RCA 6AS7G. A very good tube to start with.

[Olimar404]

So I think I want to test some other tubes in my crack otl, several of you have recommended the 6H13C

I'm a little confused with these markings

if you go to eBay you find this seller

12-rocketman or the link that monsterdonkey on October 06 posted ("Sorry, you are not allowed to post external links")

are these the Svetlana 6H13C you are talking about?

I get it that there are other sellers, it's just that this guy comes up as the first result when you do a search on eBay. That is if you search for 6N13S, if you search for 6H13C you get two results, one seller from France the other from UK, then "Results matching fewer words" and then the above guy comes up as number three with the 6N13S.

[cddc]

6N13S = 6H13C

6H13C is written in Russian, if translated into English it's 6N13S. So you can search for either.

Doesn't matter which seller you buy from, just check seller's credibility and price first, make sure it's a credible seller with good price.

[cddc]

When you view the photos, it's etched as 6H13C on the tube glass, coz it's a Russian tube.

But in the ads some seller will list them as 6H13C and some will list them as 6N13S.

[Olimar404]

Well one Svetlana 6H13C is ordered, cheap ~$20 including shipping

[lycos]

Does anyone know where can i get 7n7 to 12au7 adapter?

I'm looking at this adapter from ebay - will it work?: www.ebay.com.au/itm/1pc-7N7-7F7-TO-ECC82-12AU7-ECC83-12AX7-adapter-CNC-Copper-body-6-3V-heat/193442991853

[Paul Birkeland]

I'm looking at this adapter from ebay - will it work?: www.ebay.com.au/itm/1pc-7N7-7F7-TO-ECC82-12AU7-ECC83-12AX7-adapter-CNC-Copper-body-6-3V-heat/193442991853

It sure could.

[tintin]

Does anyone know where can i get 7n7 to 12au7 adapter?

I'm looking at this adapter from ebay - will it work?: www.ebay.com.au/itm/1pc-7N7-7F7-TO-ECC82-12AU7-ECC83-12AX7-adapter-CNC-Copper-body-6-3V-heat/193442991853

7N7s are relatively cheap and can work in the amp with adapter. I've bought several adapters from that seller and they have all been of good build quality and no noise. Currently using their 6SN7 adapter in the crack.

[lycos]

It sure could.

Thanks.

7N7s are relatively cheap and can work in the amp with adapter. I've bought several adapters from that seller and they have all been of good build quality and no noise. Currently using their 6SN7 adapter in the crack.

Thanks, I'm buying few adapters (incl 6sn7) from that seller too

[monsterdonkey]

I just received this tube from an eBay seller. They have several more. I’ll link to it if anyone’s interested.

Can anyone provide more information about it? It’s a Chelmer labeled Tung-Sol 6080WA maybe. Maybe the testing label is incorrect. I don’t know!. I mean info like guesses as to year and country of manufacture, or anything like that.

So far after only 30 minutes of listening I have no complaints. It plays more nicely with the RCA cleartop than my GE 6080 does. Warm, clear but not shrill. I quite like my Tung Sol/Chatham 5998, which is why I got this.

(https://i.postimg.cc/JDDFTc3q/5-EF3-E583-60-CF-4259-89-D7-6-A606-E4-F356-D.jpg)

[Paul Birkeland]

It looks a fair amount like an RCA 6080.  The white printing threw me off a little bit, but it looks like Chelmer is a rebrander in the UK.  It's unlikely that any of the printing or numbers on the tube itself really tells you much.  Is there anything acid etched into the glass?

[monsterdonkey]

No etching or any marks. Here’s a link to another tube from the same batch:

https://www.ebay.com/itm/CV5008-6080WA-Tungsol-double-O-getter-metal-base-Amplitrex-tested-3251002-/203028310018

I imagine they got a stack of these Chelmers and decided to test them as Tung-Sol for lack of any other solid information. I just noticed the word Brimar also somewhere in the ad. Ha.

So buyer beware.The one I got is not bad at all, it just may or may not be not be the exact thing I thought I bought.

[cddc]

I just received this tube from an eBay seller. They have several more. I’ll link to it if anyone’s interested.

Can anyone provide more information about it? It’s a Chelmer labeled Tung-Sol 6080WA maybe. Maybe the testing label is incorrect. I don’t know!. I mean info like guesses as to year and country of manufacture, or anything like that.

So far after only 30 minutes of listening I have no complaints. It plays more nicely with the RCA cleartop than my GE 6080 does. Warm, clear but not shrill. I quite like my Tung Sol/Chatham 5998, which is why I got this.

(https://i.postimg.cc/JDDFTc3q/5-EF3-E583-60-CF-4259-89-D7-6-A606-E4-F356-D.jpg)

It does look like RCA 6080 a lot, but it can also be a Mullard 6080. The 2 tubes are like twins, hard to tell them apart. I need more pics on the tube to confirm which one it is.