John Curl's Blowtorch preamplifier part II

[ticknpop]

The Dayton Wright LF resonance is around 40 hz when loaded with SF 6, and rises if the gas leaked from tears in the Mylar covers. The maximum bias voltage level reduces in air, also the bass cancellation frequency would increase so you knew if you had a leak .......

One or two users over the years tied to refill the speakers with methane after sealing a mylar leak -

 

[Max Headroom]

I immediately started singing "Old Man River," sounding like Paul Robeson. The prof was not amused.

So you didn't really (really didn't) sound like Paul Robeson then.

Dan.

 

[Bonsai]

I've always wanted a deep, resonant voice. I've considered throat surgery, testosterone infusement therapy, testicular augmentation - you name it. Now, on this forum I find out that all I have to do is carry around a hip flask of sulphur hex. Amazing what you learn here.

 

[a.wayne]

You left out chest cavity mod....

 

[SY]

So you didn't really (really didn't) sound like Paul Robeson then.

Dan.

Well, *I* think I did. Maybe he did, too, but he was too busy screaming at me to stop ****ing around and do the ****ing experiment.

 

[nezbleu]

testicular augmentation

Does that mean a bigger pair or more of them?

 

[SY]

Pawnbrokers have three.

 

[Bonsai]

You left out chest cavity mod....

Aahh - maybe that's the answer to my dilemma . . .

 

[Bonsai]

Does that mean a bigger pair or more of them?

What the hell do think? More and bigger!

 

[a.wayne]

You guys may want to take this to the "trannies for Calvin " thread ...

 

[a.wayne]

No. With the corrected square wave coming from the transformer they had
a nice top end. Interestingly, the higher mass of the Sulfur Hexaflouride bath
exaggerated the curve of the diaphragms when it met the outside air, so the
high frequency dispersion was quite good, much better than you see elsewhere
for large ESL's.

Sulfur Hex is apparently listed as a carcinogen. I remember Dan D' Agostino
(then the rep for DW) inhaling it so as to talk with the big deep voice...

Of course, not nearly as bad as the Ozone from the Ion Cloud Loudspeakers.

How's the move going NP ....?

 

[john curl]

Are we all 'gassed out', I hope so. Let's try to talk about audio electronics instead, can't we?

 

[elektroj]

OK, question to those who have more experience in the field..
Is it possible in 'real life' to drive either Q3 or Q4 into saturation in the schematic shown? Conditions: +/-15V supply, closed loop gain of the 'opamp'=3 or so.
Thanks,

 

[Nelson Pass]

How's the move going NP ....?

Me? I'm matching transistors and basking on the beach.

The real workers apparently finished the month's production and then moved
the company over the weekend. Back in production on Tuesday.

I was not the first one to observe that more gets done when I'm not
supervising...

 

[31697B]

I was not the first one to observe that more gets done when I'm not
supervising...

 

[31697B]

Carcinogen? I seriously doubt that. The stuff is very chemically nonreactive, and in fact it's used in several medical procedures that result in it being dissolved in blood.

Not listed as a carcinogen by anyone. You can breath easy.

-RNM

 

[a.wayne]

Me? I'm matching transistors and basking on the beach.

The real workers apparently finished the month's production and then moved
the company over the weekend. Back in production on Tuesday.

I was not the first one to observe that more gets done when I'm not
supervising...

 

[scott wurcer]

OK, question to those who have more experience in the field..
Is it possible in 'real life' to drive either Q3 or Q4 into saturation in the schematic shown? Conditions: +/-15V supply, closed loop gain of the 'opamp'=3 or so.
Thanks,

Depending on current level check for quasi-sat on the datasheet, otherwise there would not be much of a problem. Quasi-sat is when there are two breakpoints in the output resistance characteristics.

 

[scott wurcer]

Interesting, for how many days will an actual technical exchange stop this thread?

 

[john curl]

Scott, you have been part of the problem. I will start a new technical discussion when I fix some scanning issues.