[lupoal]

yes... I’m listening them right now and can confirm they sound the same... just amazing!

 

[triod750]

Some more information about C3g:
https://www.radiomuseum.org/tubes/tube_c3g.html
https://www.radiomuseum.org/tubes/tube_c3g_newi.html
https://www.radiomuseum.org/tubes/tube_c3gs.html
https://www.radiomuseum.org/tubes/tube_c3g_old.html

 

[lupoal]

thank you triod750...
what I would like to do now is to load the ampli scheme into Spice and substitute the default tubes, 6N6P and 5654, with 6SN7GT and C3g just to check if the default working points are correct (roughly) for the new tubes too...
the problem is that Spice is a kind of nightmare... especially for a rookie like me

 

[triod750]

What would you do if you found out that the working points are far from perfect but it still sounds good? Would you trust your ears?

I hope you share what you find. It would be interesting to know.

 

[lupoal]

if they will be close enough to be good enough I will not care... if they will be far then I could start thinking to diy LDII ( this ) with the same circuit layout but optimized components (that doesn't mean crazy expensive)

if I reach something I will share... I think will take time and i'm absolutely not sure I will be able to run a decent simulation... but it's an hobby so I can take it easy

... or I could built THIS

 

[triod750]

Ten years ago someone promised me to build that Heinrich Siemens C3g amp you linked to. For me. Haven't seen it yet. So I suggest that you build it and tell us how it compares to Little Dot. I know of another person who built it and was very satisfied with it. Unfortunately I haven't listened to it yet.
Even better would be if you built both. Yes. Build both!

 

[lupoal]

ahahahahah.... you make it so easy

no problem, send me all components required and I will build both

just kidding

anyway... the fact that the Siemens one use only two tubes instead of the most common four/six give me some doubts about the expected life of C3g used in that way... mmmm

 

[cottoff]

Hi all, recently bought a Little Dot MK2 - just wondering has anyone used EI 6HM5's as power tubes? And if so how do they compare to Russian 6n6p?
For reference these are the 6Hm5's I'm interested in:
https://www.ebay.com.au/itm/6HM5-EC...m3a9e64ab1c:g:~fkAAOSw4DJYe-Ce&frcectupt=true

Thanks in advance.

 

[triod750]

Hi all, recently bought a Little Dot MK2 - just wondering has anyone used EI 6HM5's as power tubes? And if so how do they compare to Russian 6n6p?
For reference these are the 6Hm5's I'm interested in:
https://www.ebay.com.au/itm/6HM5-EC...m3a9e64ab1c:g:~fkAAOSw4DJYe-Ce&frcectupt=true

Thanks in advance.

The 6HM5 is used as input tubes in Little Dot. They are pentodes that become strapped as single triodes in the amp. 6N6P are dual triodes that are used as output tubes. 6HM5 have 7 pins and 6N6P has 9 pins. 6HM5 in the 'large bottle' you are linking to are considered good input tubes in Little Dot.

 

[TrollDragon]

Hi all, recently bought a Little Dot MK2 - just wondering has anyone used EI 6HM5's as power tubes? And if so how do they compare to Russian 6n6p?
For reference these are the 6Hm5's I'm interested in:
https://www.ebay.com.au/itm/6HM5-EC...m3a9e64ab1c:g:~fkAAOSw4DJYe-Ce&frcectupt=true

Thanks in advance.

Like triod750 said those are driver tubes only.

One of the best IMHO.

 

[lupoal]

Some more information about C3g:
https://www.radiomuseum.org/tubes/tube_c3g.html
https://www.radiomuseum.org/tubes/tube_c3g_newi.html
https://www.radiomuseum.org/tubes/tube_c3gs.html
https://www.radiomuseum.org/tubes/tube_c3g_old.html

so I took my part in the auction (ebay) and I won... these are the two tubes I'm waiting now

am I right when I say that they have the same pin-out as all the other I already have? (sr. nr. 150401 and 150407) ? ... that story about "old" "new" "last more common" is a little bit worringsome

with these I'm going to start the Siemens amp (probably)

 

[triod750]

I checked a C3g lying right beside me and the number on that was 1162738. I have four more with slightly lower number but seem to remember that they all have 7 digits. I suppose we could call our tubes 'standard C3g', the one we normally speak of and use. Don't think you have to worry the least.

I wish you luck with your Siemens amp. I have a pair of Lorenz made C3g on their way to me. They would not be a proper choice in a Siemens amp .

 

[lupoal]

do you expect they will sound very different from Siemens labeled ?
here are some info/history about C3g... unfortunately many pictures are lost... click

 

[triod750]

do you expect they will sound very different from Siemens labeled ?
here are some info/hystory about C3g... unfortunately many pictures are lost... click

I will let you know when I have them. I just wanted to try them. Previously in this thread @gibosi has written about C3g branding and that most of these later made tubes with shiny black cans and white silk screened text were actually all made by Siemens, even if they are branded Valvo, Telefunken, Lorenz or ITT. I don't know where to find it right now. Perhaps he might comment on this.

 

[gibosi]

I will let you know when I have them. I just wanted to try them. Previously in this thread @gibosi has written about C3g branding and that most of these later made tubes with shiny black cans and white silk screened text were actually all made by Siemens, even if they are branded Valvo, Telefunken, Lorenz or ITT. I don't know where to find it right now. Perhaps he might comment on this.

Yes to the best of my knowledge, all C3g with shiny black cans and white silk-screened text and logos were manufactured by Siemens, regardless of branding. If the tube has a flat-black can and embossed top, it was manufactured by the company indicated on the can. Again, to my knowledge, only Siemens, Telefunken and Lorenz manufactured this tube. And to my ears, the Siemens and Telefunken sound very similar, but the Lorenz is noticeably darker and warmer.