Little Dot Tube Amps: Vacuum Tube Rolling Guide
Dec 22, 2020 at 7:42 PM Post #12,466 of 12,832

gibosi

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Recently I was very disappointed when listening to a pair of Tung-Sol Chatham 6080. In the same lot a pair of 'ordinary' Tung-Sol 6080 were included. I am listening to them right now with CV4010 as input and they are clearly better, in fact not bad att all. Maybe the first pair is 'tired'. At least it's useless. This pair is quite listenable. That means that I can't write off the 6080 type tubes. Thougt it would be fair to report this. It took about an hour of warming up until they started to sound decent. Another hour had me warmed up to them.

It would be useful to know if these tubes look identical? There are two versions of the Tung-Sol / Chatham 6080. One has metal plates and one has graphite plates. ???
 
Dec 22, 2020 at 7:59 PM Post #12,467 of 12,832

triod750

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It would be useful to know if these tubes look identical? There are two versions of the Tung-Sol / Chatham 6080. One has metal plates and one has graphite plates. ???

They look the same to me. I can see no difference at all. I just changed the CV4010 for C3g and wow! Just better from top to bottom. I will have to listen to this for a while but it's time for bed. Bad timing!
 
Dec 22, 2020 at 8:25 PM Post #12,468 of 12,832

Rakyat02

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Wanna ask some questions relating to the spreadsheet at page 77. Kinda confused as it is but according to the spreadsheet 6BE6 can be used to the socket as it is without tinkering with anything correct?, then how do I use the 6AU6 cause the picture on that page has gone corrupt
 
Dec 22, 2020 at 8:37 PM Post #12,469 of 12,832

gibosi

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Wanna ask some questions relating to the spreadsheet at page 77. Kinda confused as it is but according to the spreadsheet 6BE6 can be used to the socket as it is without tinkering with anything correct?, then how do I use the 6AU6 cause the picture on that page has gone corrupt

It is true that the 6BE6 can be run as an EF91/92 or an EF95, with or without the various strappings (socket wire mods). But it will sound different in each of these configurations. So you might want to try all of them to see which sound best to you.

The 6AU6 can be used only in a socket configured as EF95 with the 2/7-Socket Wire Mod.
 
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Dec 25, 2020 at 3:06 PM Post #12,470 of 12,832

triod750

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I have given the GE 6BX7GT a lot more time in Dotty together with C3g and think they are better than T-S 6080, 6H13C and coin base 6BX7GT for my music. They have 'matured' and I have adapted, probably. A lot of bang for the buck. That tube type is very popular among owners of another amp, the Glenn OTL. They try a lot of tubes, just like we do.
Another plus than sound is that the tube, with external heater PSU, runs very cool in Little Dot. It taxes the components less than 6N6P does, I guess. Just guesswork, mind you.
 
Dec 29, 2020 at 12:37 PM Post #12,471 of 12,832

triod750

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I have something odd to report. When exploring some of the output tubes I found a Raytheon 6SN7GT Bad Boy lookalike and one Sylvania VT231 and put this odd pair together with @Deyan heater PSU. Both were NOS when I received them, the Sylvania pretty cheap since the triodes were unbalanced (something we know is of little importance in Dotty). Unexpectedly they made some slightly aggressive sounding music quite listenable. I tried a few recordings and enjoyed them. They give a relaxed listening. So much so that they have stayed in service and I have listened to quite a few rock albums. I imagine that the external PSU make them sound a little livelier but still relaxed. (Notice that I wrote 'imagine').
 
Dec 30, 2020 at 1:43 PM Post #12,472 of 12,832

triod750

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Another report. In the late sixties I bought an integrated 'music center'- a BSR Ferguson with a Garrard integrated record player. I also bought, around that time, a set of headphones - the revolutionary Sennheiser HD414. I have needed a set of headphones for my laptop and last week I found at a local auction site a pair of Sennheiser HD414 for about $12:50. They were delivered today and I plugged them in to Dotty. The sound is as charming today as it was back then. Ethereal with Jobim and no disturbing bass :).
It gives about 25-35% of what HD650 does (with the same settings). But it is clean.
 
Dec 30, 2020 at 4:04 PM Post #12,473 of 12,832

MIKELAP

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Wanna ask some questions relating to the spreadsheet at page 77. Kinda confused as it is but according to the spreadsheet 6BE6 can be used to the socket as it is without tinkering with anything correct?, then how do I use the 6AU6 cause the picture on that page has gone corrupt

I still have a lot of those with the adapters barely used 10 TUBES SYLVANIA JAN 6AU6WA 23-09-2013  (2).JPG6AU6 TO 6AK5 ADAPTER L.D.MK3 $25.00.jpg
10 TUBES SYLVANIA JAN 6AU6WA 23-09-2013  (3).JPG
 
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Jan 1, 2021 at 10:23 AM Post #12,475 of 12,832

MIKELAP

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Hi

I am just got the LD mkII, search the drive tube and power tube. Have any suggestions

Drive tube may be mullard M8100, GE5654W and Voshkod 6ZH1P-EV

Power tube, not idea 💡 Check Page 201 post 3007 maybe can use with MK2

1609514616737.png
 
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Jan 1, 2021 at 5:18 PM Post #12,476 of 12,832

MIKELAP

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I was looking at the old power tubes review ,where are all the pictures???? like on page 1 there use to be pictures there gone and i've noticed this on a few thread .What the hell Headfi .A picture worth a thousand words .Really .dissapointed .
 
Jan 1, 2021 at 11:10 PM Post #12,478 of 12,832

MIKELAP

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Mikelap

Thanks a lot
However Too expensive for 6H30P-DR, Reflektor
The last setup i had with my MK3 was 6sn7 as power tubes with adapter 6sn7 to 6cg7 adapters and C3G as driver tubes with adapters C3G to 6AK5
 
Jan 9, 2021 at 6:25 PM Post #12,480 of 12,832

lupoal

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hi,

I‘m driving now couple of 6H8C (1952) with two Telefunken EK90 (EF95) and I’m very happy... I would buy a couple of TFK EK90 as spare parts but they are quite rare... what other brand could I consider to not go too far away from that sound signature?
 
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