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In Reply to: RE: Goodbye Type 45 ....... hello JJ 2A3-40 posted by drlowmu on October 10, 2016 at 11:34:51
First post here :)
Don't blame the tube , it could easily be implementation related , assuming this is a DIY rather than commercial amplifier
Sounds like you have a power supply related issue . Swapping a type 45 to a 300B (or rather a 2.5V filament 300B in the case of the 2A3-40) , you were obviously using a suboptimal supply configuration for the type 45 , which IMO is one of the more perfect tubes out there . I suspect if you measure the output impedence with the 45 in place you will see anomalies which can be isolated to the power supply configuration . Inadequate reservoir capacitance is probably the culprit
John Rush
Follow Ups:
Poor PS implementation is not restricted to DIY-ers by any stretch. Not even close...:)
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
Yes, it was a DIY amp, and ( IMHO ) I likely build one of the best designed ( and executed ) supplies ever done in the entire history of SET audio !!It IS the ST or Globe 45 tube, a broad midrange suck out !!
But, if you are happy with it, and it works in your high uF circuit, that is great !! Use it. enjoy it.
Jeff Medwin.
Edits: 10/12/16 10/12/16 10/12/16
See link . Hope this helps . I think I'll be avoiding this place in future
Hopefully will see some of you at RMAF or at the London Novotel show in 2017 :)
John Rush
John, I was struck by this line in the Wikipedia page you linked to:
"People with NPD tend to exaggerate their skills and accomplishments as well as their level of intimacy with people they consider to be high-status."
Cheers,
Chris
Would that be Dennis?
I don't understand why some have not been banned by now. I lay low and tend not to respond when certain people are active here and usually end up posting on another forum.
It's too bad you were subjected to this abuse so soon after posting. The great majority of us here do understand your technical points. Can I request a favor and ask that you just send a quick note to the mods? This behavior has been problematic here for some time, and it now seems virtually impossible to attract any new talent to the forums as a result.
--------------------------
Buy Chinese. Bury freedom.
Hello,
Wanted to write to you to apologize on your first post, and do a further explanation. But there was no way to contact you through the forum. I am sorry about this.
Were you at RMAF last week? I was. By any chance did you hear the ALTEC 604 MLTL and 2A3 system there?
Is there any way we can correspond? I have some material for you to see.
Jeff Medwin
A designer should always ? there work doubt there design make it prove that its right. If a designer feels they are the worlds best they most certainly are not.
The folks who claim to have the answers usually have none.
When you see a bunch of pseudo-technical terms applied to justify their results...followed by an attack on those who exercise an Engineering analysis ought to be enough reason to ignore.
That this sort of behavior is well documented, it looks more like some sort of willful ignorance or just outright nastiness to keep pushing it.
I just love laughing at the claims. So utterly ridiculous...like a 2A3 amp with just the right wiring and a driver stage designed to start rolling off in the early 5 digit CPS domain able to deliver power 1-2 orders of magnitude higher than its actual capability. OMG...and the response when asked is to suggest traveling some hundreds of miles to hear one for myself????
Are you out ov yer Vulcan mind, Spock?
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
And a speaker designer should always question there (sic) spelling. However, I agree with you 100%.
There's fixed bias, cathode self bias, grid leak bias and confirmation bias.
Jeff's amps mostly use the latter.
~!
The Mind has No Firewall~ U.S. Army War College.
n
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