|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
64.12.116.131
In Reply to: Type 45 etc posted by elektron on March 27, 2006 at 14:48:47:
The 45 tubes maximum power was rated by the RCA manual for 2 watts at 275V. That's before Roger Modjeski turned the tables with a new application and got over 4 legitimate watts out of a pair of 45's with no gimmicks.
Follow Ups:
glenz, hi. I believe RCA published data that showed 1.6 W as max single tube Class A. Later additions may have bumped it up to 2 W - but who is going to quible about 0.4 Watts? Not me.The so-called "45" that RAM labs is selling may deviate from the RCA specifications enough that it falls outside the parameters of what a Type 45 is. It should be called a "45-A" or something to make it clear it is Not a 45 but rather something akin to a 45 with higher dissipation. This cavalier attitude with specifications is just plain annoying.
Hi Elektron:
I know a little something about this tube.http://www.vt4c.com/bb/viewtopic.php?t=151 This is a 45 amp I built 3 years ago.Regards,
Hi Elektron:
Here is the RCA 45 application.......
As Single Tube Class APlate voltage 180V 250V 275V
0.825W 1.6W 2.0W
Pick your poison!
BTW What do you mean by cavalier?
If one is going to build a 45 tube it should probably meet fairly closely the parameters set by RCA who engineered the 45. That a company can make a tube which is called a "45" but has much different dissipation and who knows what other differences (heater current, inter electrode capacitance, etc.) is, in my opinion, cavalier. That is to say not paying any heed to the characteristics that would qualify the tube to be a Type 45 tube in the first place. Cavalier - showing willful disregard. Just saying a tube is a 45 or branding it so does not make it a 45. Thus my usage of the word cavalier.
Elektron:
By the way, what do you mean by a different dissipation? it doesn't have different dissipation. It's dissipation is within the guide lines set by RCA. Why would you mention that? I never did!
I beg to differ with you, and I'm not sure what kind of practical experience you have or wheather or not you have a degree in electrical engineering. However, Let me mention something that you might not know.....The application and ratings for tubes were done as a guideline for designer's(a blueprint if you will)It was not to be the end all or the holy grail for designing. This comes from the mouth
of an applications designer who had been employed by RCA fro 35 years.
By the way, how many amplifiers have you built?
glenz, hello again. You seem itching for a fight. I find that both odd and humorous. You beg to differ with me? About what? Uniform standards of manufacture of various types of electron tubes?Are you on the moon?
Elektron:
I was perilously close to calling you a "hack", but after reading your discription of globes vs ST's, I'll cut you a little slack. Still you miss the point of comparison by a very slim margin. You almost give the reason for the difference in the sound, but come up shy. A good effort though. should you want to talk further, I'll share something with you.
We were talking initially about a 45 tube(old style)and getting 4 plus watts from it. That's right. The original 45. As far as picking a fight, not really. But unlike you, I know what I'm talking about and have the background to prove it!
The craftmanship of that 45 amp is anything BUT cavalier Glenz
> smile <
This post is made possible by the generous support of people like you and our sponsors: