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Old 22nd November 2011, 08:59 PM   #11201
GOR3 is offline GOR3  United States
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Old 22nd November 2011, 09:20 PM   #11202
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ClassA fish. Though, are the fins large enough?
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Old 22nd November 2011, 09:22 PM   #11203
GOR3 is offline GOR3  United States
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It's a turbot, operating in Class Sea. Water cooled.
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Old 22nd November 2011, 09:46 PM   #11204
bsabel is offline bsabel  United States
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It's a turbot, operating in Class Sea. Water cooled.
HAHAHAHAHAHAHA!!!! Now that's funny!
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Old 22nd November 2011, 09:50 PM   #11205
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Originally Posted by GOR3 View Post
operating in Class Sea.
It sure doesn't at half an hour's drive from my place.
Seafarm - Razor Clams

(ahh, the downsides of being able to have fresh turbot 7/7. Frozen turbot taste like crab from buttock)
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Old 23rd November 2011, 02:39 AM   #11206
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Originally Posted by Nelson Pass View Post
The F5 continues to be more popular than I expected. As a reward to the
faithful, I have completed the F5 Turbo.

The pc boards are on order, and when they arrive I will present it complete.



ps - you can modify existing F5's to make one.
A turbo? Wow--I'm ready to order intercoolers and larger fuel injectors today!

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Old 23rd November 2011, 03:24 AM   #11207
6L6 is offline 6L6  United States
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As long as we are making the automotive analogy, you might want a bigger cooling system...
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Old 23rd November 2011, 04:59 AM   #11208
EUVL is offline EUVL  Europe
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Turbo means more power without adding engine capacity.
So more power without adding output devices and increasing power supply ?




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Old 23rd November 2011, 09:00 AM   #11209
AndrewT is offline AndrewT  Scotland
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Turbo means more power without adding engine capacity.
Turbo and similar supercharging, usually means more air and fuel input resulting in more torque.
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Old 23rd November 2011, 10:24 AM   #11210
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Originally Posted by AndrewT View Post
Turbo and similar supercharging, usually means more air and fuel input resulting in more torque.
In an engine, the increased output pressure feeds back into more input pressure.
I see turbo in our domain as a kind of feed-forward, or positive feedback. Think bootstrap or Quad 405. Also some tube amplifiers like MacIntosh C22 had a positive feedback loop between anodes and cathodes. An interesting turbo configuration has been mentioned for a tube output, where a cathode resistor connects to the gate of a high-voltage FET device - as the 300B ran into e.g. 200 mA, the increased cathode voltage opens the FET - implying a partially decoupled cathode of course.

What I could expect here is some merge of F5 and BA-3/BA#2 typology. For instance, some extra output devices that only kick in after some threshold in current is reached.
Just thinking - For fun: instead of having the limiter output from Q5/Q6 LIMIT the drive voltage to the output FETs Q3/Q4, have that DRIVE a BA#2 push-pull output stage. So the LIMITER becomes a BOOSTER.

But we wouldn't have to stop here:

In such a topology, it might be possible to insert a small resistance between the two output stages I think, it's value being trial & error.

What I am thinking about: A variable feedback differentiation was also once used in a Kaneda amplifier, where a potmeter of 100 ohms was used to change the amount of coupling between the output of the driver stage & the push-pull output. It has impact on the damping. (A positive influence, for many loudspeakers, less is more - less damping more enjoyable). In such a config the closed loop amplification stays the same, the output impedance differs.

And hence: you can dial in more "BA-3/BA#2 style sound" versus "F5" sound.

albert

Background on Kaneda design: 'Un amplificateur classe A 50W+50W, 1re partie: conception générale, P. Johannet & W. Walther, L'Audiophile, No. 43, 1988
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