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Little Dot Tube Amps: Vacuum Tube Rolling Guide - Page 410

post #6136 of 10586

I just received some new tubes for my mkvi+ :)

 

 

The left grey one is the original tube, right is Ken rad VT-231! 

 

 

 

This is the RCA 6SL7GT grey glass version!

post #6137 of 10586
Quote:
Originally Posted by hypnos1 View Post
 

Hey guys...a word of WARNING, if anyone is thinking of buying the 8A voltage regulator/converter I posted a while ago.

 

After a near heart attack when the gorgeous glow from my 6AS7Gs disappeared - I always assume the worst! - it turned out to be said cheapo chinese converter. At £4.99, incl shipping, I should have known better. Mind you, with the possible high initial surges from the 6AS7Gs I suppose it isn't really fair on the poor thing! Probably, all would be well using 2 of same :rolleyes:...

 

Might just bite the  bullet and get a proper unit, now I know it would be well worth the investment, lol.

 

Cheers

 

Cheap Chi-Nee schiit will bite you on the ass every time.

Your just lucky it only burned out and didn't go the other way dumping the source voltage into the filaments...

 

Get one of these and never worry again.

http://www.ebay.com/itm/0-20VDC-Adjustable-10A-Power-Supply-PS10AD-/180632120608

post #6138 of 10586
Quote:
Originally Posted by gibosi View Post
 

Received this little treasure the other day: An E80CC manufactured in Hamburg, Germany, October, 1956 (WK2 D6J). It has a horseshoe getter and pinched waist. However, the pinching is not as deep and well-defined as it is on my 1955 Eindhoven tube. I got it for $45, shipped from Germany, which isn't too bad when you consider a pair of C3g's go for around $75. Like the C3g, the E80CC is an ultra-linear, frame-grid tube. And in fact, it has a signicantly lower distortion figure than the C3g. (That is, when we strap the C3g, to convert it from a pentode to a triode, the distortion increases to a level approaching that of a 6SN7, still quite low, but not as low as the E80CC.)

 

Have spent a few hours with this tube, and in my opinion, this is right up there with the C3g, top-tier.

 

 

Looks like you've found another really nice tube,g - too late for me, anyway! Keep up the good work (is there no bottom to your wallet lol?!).

 

 

Quote:
Originally Posted by TrollDragon View Post
 

 

Cheap Chi-Nee schiit will bite you on the ass every time.

Your just lucky it only burned out and didn't go the other way dumping the source voltage into the filaments...

 

Get one of these and never worry again.

http://www.ebay.com/itm/0-20VDC-Adjustable-10A-Power-Supply-PS10AD-/180632120608

 

Yes TD, it does NOT pay to go too cheap - with anything! So I'll be investing in a bench DC power supply - but one not quite so expensive, methinks!

But looking on the bright side, at least it provided the necessary - and very cheaply - for me to check those resistor temperatures...so all was not wasted, really :o.

post #6139 of 10586

Really what you need instead of a power supply is a DarkVoice / LaFigaro 339, it will take 6AS7's or 6080's by default as power tubes with pentodes as drivers. The build quality on this amp is incredible so it would be very easy to conver the driver sockets to C3g/s pentode sockets.

 

Reposted from the DarkVoice 339 thread.

 

 

Now for the best part...

 

Cathode Resistors...

:beerchug:

post #6140 of 10586

Or get a Glenn OTL.

 

 

uses 6AS7's, 6SN7's as power/driver and 3DG4/5U4 rectifiers and sounds glorious!

post #6141 of 10586
Quote:
Originally Posted by kvtaco17 View Post
 

Or get a Glenn OTL.

 

 

uses 6AS7's, 6SN7's as power/driver and 3DG4/5U4 rectifiers and sounds glorious!

I was wondering how much does Glenn roughly charge for the amps he produces? such as the one pictured

post #6142 of 10586
Quote:
Originally Posted by sgbwill2 View Post
 

I was wondering how much does Glenn roughly charge for the amps he produces? such as the one pictured

I will PM u

post #6143 of 10586
Quote:
Originally Posted by hypnos1 View Post
 

Looks like you've found another really nice tube,g - too late for me, anyway! Keep up the good work (is there no bottom to your wallet lol?!).

 

Quote:
Originally Posted by TrollDragon View Post
 

Really what you need instead of a power supply is a DarkVoice / LaFigaro 339, it will take 6AS7's or 6080's by default as power tubes with pentodes as drivers. The build quality on this amp is incredible so it would be very easy to conver the driver sockets to C3g/s pentode sockets.

 

 

There is no denying that I buy a lot of tubes.... But I do so with the long view in mind. I consider most of the tubes I purchase to be investments for the future. The E80CC I just purchased for $45 often goes for around $100 and more. I never pay top dollar. And therefore, worst case, if I decide to sell this tube, I can always get back at least what I paid, and very probably more.

 

However, it is not really my intention to sell these tubes. This is only a fallback plan, Plan B. Plan A is to use them in any future amp I buy. And so, as much as it appears that the DarkVoice / LaFigaro 339 is a great amp, it is incompatible with all my current tubes, and I won't even consider it. My current tubes must work in my next amp in order for my current investment to pay off. And fortunately, this restriction is very easy to live with, as there are plenty of wonderful amps that use these tubes. The hardest part is deciding which amp to get. :)

post #6144 of 10586

Thinking ahead is always a good idea:wink:

For example i have 12A.. 6SN7 6SL7 12SN7 and 6AS7 tubes all will work with my future CRACK. 

post #6145 of 10586

Just received my Ken-Rad VT231 tubes and playing them now with some BTB EF95 blue tubes...sounding solid, full bodied and noticeably more harder hitting bass thumps. I'm liking it over my generic 6SN7s.

post #6146 of 10586
Quote:
Originally Posted by Rossliew View Post
 

Just received my Ken-Rad VT231 tubes and playing them now with some BTB EF95 blue tubes...sounding solid, full bodied and noticeably more harder hitting bass thumps. I'm liking it over my generic 6SN7s.

 

The Ken-Rad's are one of the very best 6SN7's for bass, no doubt about it. But how are you liking the mids and the highs?

post #6147 of 10586
Quote:
Originally Posted by TrollDragon View Post
 

Really what you need instead of a power supply is a DarkVoice / LaFigaro 339, it will take 6AS7's or 6080's by default as power tubes with pentodes as drivers. The build quality on this amp is incredible so it would be very easy to conver the driver sockets to C3g/s pentode sockets.

 

Reposted from the DarkVoice 339 thread.

 

 

Now for the best part...

 

Cathode Resistors...

:beerchug:

 

WOW!...Just love those resistors...(what on earth is happening to me? :confused_face:).

 

Sure is one beautifully-built piece of kit - are you intent upon bankrupting me or what?! IF my beloved MKIV SE should die on me one day, I could be sorely tempted by this beauty...especially as I could use my C3GSs. Better get saving, eh? - if only to pay for the accursed customs charges!!

 

 

 

Quote:
Originally Posted by kvtaco17 View Post
 

Or get a Glenn OTL.

 

 

uses 6AS7's, 6SN7's as power/driver and 3DG4/5U4 rectifiers and sounds glorious!

 

So you want to see me broke as well, mon ami? What chance do I stand? - another lovely-looking machine :tongue_smile:. Perhaps I should try the lottery after all!...

 

 

Quote:
Originally Posted by gibosi View Post
 

 

 

There is no denying that I buy a lot of tubes.... But I do so with the long view in mind. I consider most of the tubes I purchase to be investments for the future. The E80CC I just purchased for $45 often goes for around $100 and more. I never pay top dollar. And therefore, worst case, if I decide to sell this tube, I can always get back at least what I paid, and very probably more.

 

However, it is not really my intention to sell these tubes. This is only a fallback plan, Plan B. Plan A is to use them in any future amp I buy. And so, as much as it appears that the DarkVoice / LaFigaro 339 is a great amp, it is incompatible with all my current tubes, and I won't even consider it. My current tubes must work in my next amp in order for my current investment to pay off. And fortunately, this restriction is very easy to live with, as there are plenty of wonderful amps that use these tubes. The hardest part is deciding which amp to get. :)

 

Looks like I will have to call you 'wile-e-coyote' from now on, gibosi...certainly method in the madness, lol!

 

But yet another deserter from the camp in the offing? What shall we do if you disappear from our midst?...All head for the Figaro or Glenn perhaps?! - is there a VERY generous, well-wishing philanthropist out there taking pity on us poor tube-rollers? Methinks not, alas :frown:.

Ah well, must get back to my (pining) more humble offering...I think I've upset her somewhat! But I shall reassure her...once my 'proper' power supply arrives, that is!!

post #6148 of 10586
Quote:
Originally Posted by hypnos1 View Post
 

 

WOW!...Just love those resistors...(what on earth is happening to me? :confused_face:).

 

Sure is one beautifully-built piece of kit - are you intent upon bankrupting me or what?! IF my beloved MKIV SE should die on me one day, I could be sorely tempted by this beauty...especially as I could use my C3GSs. Better get saving, eh? - if only to pay for the accursed customs charges!!

 

 

 

 

So you want to see me broke as well, mon ami? What chance do I stand? - another lovely-looking machine :tongue_smile:. Perhaps I should try the lottery after all!...

 

 

 

Looks like I will have to call you 'wile-e-coyote' from now on, gibosi...certainly method in the madness, lol!

 

But yet another deserter from the camp in the offing? What shall we do if you disappear from our midst?...All head for the Figaro or Glenn perhaps?! - is there a VERY generous, well-wishing philanthropist out there taking pity on us poor tube-rollers? Methinks not, alas :frown:.

Ah well, must get back to my (pining) more humble offering...I think I've upset her somewhat! But I shall reassure her...once my 'proper' power supply arrives, that is!!

 

I shall tempt you no more...

 

 

 

 

 

 

 

...unless shots of tubes in the dark are tempting...

post #6149 of 10586

I have the 12AX7 adaptor from MIKELAP running before my C3G's are tested. On top of the Adapter is a 12AX7 to 6SL7 adapter and i plugged in a reissue tube Tung Sol 6SL7GT with brown base. At first it was a bit bass shy and its still burning in and now the bass has gotten better.

UPDATE:after about 5-10 albums the tube has become very resolving with more detail than my vohskods.I did hear some bass bleed into the mids but i expect that to be a burn-in issue. Bass is good now too. Highs are very present but not sharp on my HD650. Album i listened to was "Brighten the Corners" from Pavement.This album is very good for testing distortion of the drivers as in the song "Stereo". Until now i think only my T50RPs haven´t clipped but i can test so if someones wishes me to.

 


Edited by superdux - 5/17/14 at 2:24pm
post #6150 of 10586
Quote:
Originally Posted by hypnos1 View Post
 

Sure is one beautifully-built piece of kit - are you intent upon bankrupting me or what?! IF my beloved MKIV SE should die on me one day, I could be sorely tempted by this beauty...especially as I could use my C3GSs. Better get saving, eh? - if only to pay for the accursed customs charges!!

 

But yet another deserter from the camp in the offing? What shall we do if you disappear from our midst?...All head for the Figaro or Glenn perhaps?! - is there a VERY generous, well-wishing philanthropist out there taking pity on us poor tube-rollers? Methinks not, alas :frown:.

Ah well, must get back to my (pining) more humble offering...I think I've upset her somewhat! But I shall reassure her...once my 'proper' power supply arrives, that is!!

 

Without knowing how pentodes are configured in the Darkvoice 339, it may or may not be a simple matter to use the C3g. The Cg3 has more gain than most pentodes. In fact, even strapped as a triode, it has more gain than many unstrapped pentodes....

 

If and when I do get another amp, I will certainly keep using my LD. One of the real advantages of a hybrid is being able to compare drivers. For example, I have a bunch of ECC40's from as many as 8 different assembly lines that I want to compare. The LD 1+ is superb for this. More lowly, but very important, is burning in new tubes. With a solid-state output I would not be putting needless hours on power tubes. And getting another amp will free the LD up to try more strange tubes. For example, if my LD is out of commission for a week as I configure and rewire my external socket, I can listen to my new amp. I want to give the E182CC a try. And even more strange, I want to try to roll a pair of common-cathode E90CC's by converting these double triodes into single triodes. I will need two 7-pin external sockets for this. So I anticipate that I will continue to be a presence here, and I expect that I will continue to push the envelope :)

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