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Old 18th September 2010, 05:19 PM   #1
Stee is offline Stee  Italy
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Default Power tube buffer

as you know
the accurate sound of the Valves does not give a deep bass, never
this Balanced buffer does not lose quality of your acoustic scene
and Complete the soul finally adding a body to music
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Old 18th September 2010, 05:23 PM   #2
DF96 is offline DF96  England
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Valves work fine down to DC, but transformers do not. Nothing you add after the transformer can change this.
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Old 18th September 2010, 06:14 PM   #3
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Quote:
Originally Posted by Stee View Post
as you know
the accurate sound of the Valves does not give a deep bass, never
this Balanced buffer does not lose quality of your acoustic scene
and Complete the soul finally adding a body to music
Please tell me more.
What is the input impedance of the transistor buffer?
Is the transformer a typical tube output transformer, or is it a matching transformer between stages? If it is a transformer at the output of a tube power stage with limited bass output that is what your buffer will have, limited bass.
Where does the idea that tubes plus output transformer lacks a deep bass come from? Depending on the transformer 25 Hz to 20K Hz bandwidth is not uncommon (also not cheap).
DT
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Last edited by DualTriode; 18th September 2010 at 06:17 PM. Reason: oops
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Old 18th September 2010, 06:58 PM   #4
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It reminds me some popular in 1970'th power amps-plugins that had PS, output transistors, and trifilar input transformers. Such an amp driven by a boombox sounded very loud. But did it sound clean?
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Old 18th September 2010, 07:27 PM   #5
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Originally Posted by Wavebourn View Post
It reminds me some popular in 1970'th power amps-plugins that had PS, output transistors, and trifilar input transformers. Such an amp driven by a boombox sounded very loud. But did it sound clean?
I remember "Mindblowers" by Tenna; 6x9 speakers with special voice coils and similar buffer circuits (I used to install car stereo...), about 80 watts out of a 12V supply... Mounted in the rear window of a TransAm or Mustang they would definitely cause hearing damage. Lots of bass for sure!

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Old 18th September 2010, 07:37 PM   #6
Stee is offline Stee  Italy
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Default Load change source performance

the really transformer's 25 Hz to 20K Hz bandwidth depends of your load
also of your power level
specific data and parameters often make us lose the overview
best adjustement is move 10KOhm values to have Ic 2A @ 8 Ohm load (3A@6Ohm)
so need a very big dissipator for each channel
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Last edited by Stee; 18th September 2010 at 07:40 PM.
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Old 18th September 2010, 09:31 PM   #7
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Yes, that's how we sold Mindblowers. We explained to people that their existing car stereo will sound better because it's not driving speakers, just the "easy load to drive" input of the Mindblowers, and the Mindblowers are doing all the work!

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Old 19th September 2010, 06:44 AM   #8
Stee is offline Stee  Italy
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Arrow the missing link in the chain

in structural projects, there are two safety factors, static is third of dynamic.
in short I am arguing that the TUBES output transformers are undersized 3 times.

I tried to shunt the secondary in parallel instead series (4 and 8 Ohm to 2 Ohm)
...improves but not enough.

advantage of the buffer is to isolate the reactive power back from the speakers on the negative feedback of tube.

you do not have large heat sinks may adopt a bias AB1 (0.5 A)
in this case it is better to use identical components with gain (gain means speed)

I found the same gain (Hfe 100) with A1302 and C5200
two generations who marry perfectly
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Last edited by Stee; 19th September 2010 at 06:56 AM. Reason: add jpg
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Old 19th September 2010, 07:34 AM   #9
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Which tube do you smoke today, Stee?
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Old 19th September 2010, 08:33 AM   #10
Yvesm is offline Yvesm  France
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Quote:
Originally Posted by Stee View Post
in structural projects, there are two safety factors, static is third of dynamic.
in short I am arguing that the TUBES output transformers are undersized 3 times.
Why not simply using larger ones

Yves.
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