[Xcalibur255]

Do the Elrogs have a lower recommended operating point? I noticed you're running them with 10mA lower plate current vs. the Taks.

 

[leftside]

Do the Elrogs have a lower recommended operating point? I noticed you're running them with 10mA lower plate current vs. the Taks.

I'm playing on the safe side until I can find out the recommended operating point. I contacted Elrog but they said "consult your amp manual"... I could try Glenn but he's AWOL.

 

[L0rdGwyn]

I'm playing on the safe side until I can find out the recommended operating point. I contacted Elrog but they said "consult your amp manual"... I could try Glenn buts he's AWOL.

Both the Elrogs and the Taks have a 40W max plate dissipation, original Western Electrics were rated for 36W. I don't see any reason you should have to run the Elrogs cooler. If you wanted to know for sure, you'd have to measure the plate voltage Glenn used to calculate the plate dissipation (plate voltage x bias current in amps). Hard max of 40W, but it's common to bias tubes around 80% of maximum for longevity.

 

[leftside]

Both the Elrogs and the Taks have a 40W max plate dissipation, original Western Electrics were rated for 36W. I don't see any reason you should have to run the Elrogs cooler. If you wanted to know for sure, you'd have to measure the plate voltage Glenn used to calculate the plate dissipation (plate voltage x bias current in amps). Hard max of 40W, but it's common to bias tubes around 80% of maximum for longevity.

Tom just said exactly the same to me! I'll try again this evening

 

[Xcalibur255]

Usually Glenn would tell you at some point what plate voltage he was targeting for the output stage, it might be mentioned in old messages between the two of you during the build. For manual bias amps like ours it's actually kind of rough not knowing that piece of info.

 

[gibosi]

This thread has been pretty quiet as late so thought I would post a picture.

The GOTL with a pair of Chatham 6520, a Voskhod 6N23P and a Philips 1701 rectifier. Of course, it sounds great!



The 1701 is a gas rectifier, about 1930, and the gas is argon, with a 1.8V heater.

 

[heliosphann]

This thread has been pretty quiet as late so thought I would post a picture.

The GOTL with a pair of Chatham 6520, a Voskhod 6N23P and a Philips 1701 rectifier. Of course, it sounds great!



The 1701 is a gas rectifier, about 1930, and the gas is argon, with a 1.8V heater.

Ooooh, shiny.

 

[mordy]

This thread has been pretty quiet as late so thought I would post a picture.

The GOTL with a pair of Chatham 6520, a Voskhod 6N23P and a Philips 1701 rectifier. Of course, it sounds great!



The 1701 is a gas rectifier, about 1930, and the gas is argon, with a 1.8V heater.

I always wondered about the 6520 - is it just another 6AS7G? Maybe with different specs? Complicating it is that some 6520 tubes have domino plates like the 5998 - are those 6520 tubes the same as 5998?
It seems from the picture that these 6520 tubes have regular plates. These are labelled Chatham but I have seen other rebranded names as well.
And while we are at it, Here is a picture of my GOTL (in daily use) with a pair of 6S2S (6J5GT) and a sextet of 6N12S.

IMHO the 6S2S (6C2C) is a very good sounding tube but probably too cheap to be taken seriously - please don't tell anybody so the prices stay low!

 

[gibosi]

I always wondered about the 6520 - is it just another 6AS7G? Maybe with different specs? Complicating it is that some 6520 tubes have domino plates like the 5998 - are those 6520 tubes the same as 5998?
It seems from the picture that these 6520 tubes have regular plates. These are labelled Chatham but I have seen other rebranded names as well.
And while we are at it, Here is a picture of my GOTL (in daily use) with a pair of 6S2S (6J5GT) and a sextet of 6N12S.

IMHO the 6S2S (6C2C) is a very good sounding tube but probably too cheap to be taken seriously - please don't tell anybody so the prices stay low!

The fine print on the datasheet reveals that the Chatham 6520 is simply a tweaked Chatham 6AS7G. Those that look like 5998 are in fact 5998. Why Chatham/Tung Sol deliberately mislabeled them as 6520 is not known.

http://frank.yueksel.org/sheets/127/6/6520.pdf

 

[bcowen]

The fine print on the datasheet reveals that the Chatham 6520 is simply a tweaked Chatham 6AS7G. Those that look like 5998 are in fact 5998. Why Chatham/Tung Sol deliberately mislabeled them as 6520 is not known.

http://frank.yueksel.org/sheets/127/6/6520.pdf

I have a Tung Sol labeled 6520. Sounds pretty much the same to me as my Chatham 6AS7G's. Got it about a year ago for the starting bid of $4.95 'cause the seller mistyped it as a 6250 in the Ebay listing.

 

[triod750]

IMHO the 6S2S (6C2C) is a very good sounding tube but probably too cheap to be taken seriously - please don't tell anybody so the prices stay low!

As are the tubes behind them

 

[whirlwind]

This thread has been pretty quiet as late so thought I would post a picture.

The GOTL with a pair of Chatham 6520, a Voskhod 6N23P and a Philips 1701 rectifier. Of course, it sounds great!



The 1701 is a gas rectifier, about 1930, and the gas is argon, with a 1.8V heater.

I have not bought any tubes for a long time, mainly because I feel I have more than I could ever use, but those Chatham 6520 are something I do not own and I love my Chatham 6AS7G's. I have a few pair's. I guess since they sound pretty much the same, I will pass on looking for some.
Sounding like the Chatham 6AS7G is a good thing though, as those are some great sounding tubes that pair great with many driver tubes.
I have some in my GOTL now.

 

[UntilThen]

I have not bought any tubes for a long time, mainly because I feel I have more than I could ever use, but those Chatham 6520 are something I do not own and I love my Chatham 6AS7G's. I have a few pair's. I guess since they sound pretty much the same, I will pass on looking for some.
Sounding like the Chatham 6AS7G is a good thing though, as those are some great sounding tubes that pair great with many driver tubes.
I have some in my GOTL now.

I had Chatham 6520 and Chatham 6as7 but I have released them all. Onto different tube types now. Enjoy Joe, that's an iconic amp with lovely tubes.

 

[Xcalibur255]

I always felt the 6520 version of the Chatham was a hair quieter and more resolving, but the differences are minor. Not worth losing sleep over if you already own a pair of Chatham 6AS7G, but if you happen to come across some they're certainly worth having.

 

[BunnyNamedCraig]

The Chatham 6as7g’s are my fave! Does any one have any recommendations for the type of driver and rectifier I should use for good voltage synergy?