It's funny, but for some, this is the beauty of tubes; being able to 'tweak' the sound but for me it's also their weaknesses that can be annoying in that they deteriorate slowly as soon as you start using them so that you're unaware of how bad a tube might be even at close to the end of its life. You can get very accustomed to the sound and accept it as fine until it's really obvious.
Also, the subjective nature of listening to different tubes and going on 'taste' can lead to serious cases of 'tubitis' where the listener buys a shopload of the things in an attempt to 'better' their amp subjectively and it's such hit and miss activity!!
I used a tube in my Ember until it was so noisy that it sounded like a poor fm radio station hissing. I didn't really notice if I'm honest, until the very end and realised that I had been lostening through the snow. It was a nice tube as well ... an Orange Globe.
Hiss is a strange thing because we seem to have the ability to turn it off and hear through it without realising, I think.
At least you were listening to vintage hiss. It's much more pleasing than modern 21st century hiss. LOL!
As string instrument player, I know too well the sounds of deteriorating strings. And the brief sweet hours after break-in of optimum tone. I hope to approach tube rolling with a zen-like appreciation of the impermanence of all things. Especially my bank balance. ;-)
Nope didn't envison that. I did expect a lot of exotic tubes that would be used using adapters though.
A problem with tubes is that there is no single (or combination) of certain parameters that quarantees a certain sound. Yes, you can calculate gain and even frequency response etc but it is hard to predict how much 2nd harmonics the tube will generate under certain conditions. No clear correlation to perceived SQ and specs exist so hard to say what one will have to be looking for in tubes.
You could even use pentodes (in triode config) using adapters etc. This way one could add lots more suited tubes when you have an adapter that accomodates for 2 pentodes for instance. The fun part of the Ember (and other G1217 amps) is the very wide range of currents and heaters that can be used.
How the sound will turn out is partly science and partly subjective.
Pentodes? Adapters? Can we call Jeremy?
Experimentation is a big part of the appeal of tube rolling for me - tweaking to suit our own personal taste. Headphone listening for pleasure only needs to please one set of ears. And the eager ears of some internet forums. ;-)
I looked up the 12BH7 data sheet, and it seems like it will work with either a 6V or 12V heater. I wonder which setting would be better to use.
It should be set at 12V. (the 12 in 12BH7 is the indicator) In this case both heaters work as expected and get 6V. On 6V setting both heaters get just 3V and do not heat up properly. Takes more time to reach a working temperature where the cathode starts to emit electrons. It is possible the tube heaters work just enough at 3V but is far from a desirable situation.
Last Edit: Feb 10, 2018 16:10:03 GMT by solderdude
use your EARS to enjoy MUSIC .... NOT as an analyzer
Thanks guys. Does turning your amp off and on frequently shorten the life of the tubes? Like should you turn the amp off if you're not going to be using it for an hour or two, or will that cause more wear on the tube than leaving it on?
When not using it for one or two hours it may be best to leave it on. It takes time for tubes to reach optimal working temperature/conditions. This takes about 10 mins so when not using it for 1 or 2 hours you can leave it on. For more than a few hours or not sure to come back and use it again in a short time period it may be best to switch it off. No need to keep it on 24/7.
Only when using tubes that flash brightly on start-up and then glow softly tube life may be affected. When the tubes light up slowly lifespan will not be affected.
use your EARS to enjoy MUSIC .... NOT as an analyzer
What does it mean when it's not possible to set the bias low enough for a tube? I bought a 12AT7WC that seems to be in good condition, but no matter how low I set the bias on my Sunrise 3, it's apparently still too high. Is the tube simply not compatible with my amp?
I guess I can answer my own question this time. There's no point in going past where it starts clicking, that's the limit of how far it can be adjusted. After letting the tube burn in for several hours, I've actually got the bias dialed in well enough, it's still slightly high on one side though.
Welcome. Quick messages/chats but this area is emptied from time to time so nothing permanent here!!
doug48: How can I download the pdf's for the Foobar 2000 instructions?
Jul 3, 2019 0:49:07 GMT
solderdude: I don't know if there are pdf's for it... will ask Javier.
Jul 5, 2019 16:34:54 GMT
Javier: Unfortunately I don't have a PDF and Wordpress doesn't have a way to export to any format.
Jul 5, 2019 17:59:01 GMT
Javier: The only way to store the page locally is by saving it as HTML
Jul 5, 2019 17:59:44 GMT
doug48: I found a way to print the foobar docs by going to each html site and right click and select all. the open Word processer and past the selected txt and graphics. Save and go back and edit out the extra info.
Jul 8, 2019 5:12:12 GMT