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Posted On: January 28, 2005 09:26:02 PM
Name: Michael Bryant
Email:
mikialb@email.com
Comments: Here are my thoughts on the PPP 6B4G Amp.
I received my Ideal Innovations "Super 6B4G PPP Convertible" amp several
weeks ago and would like to share my thoughts about it with you.
This is the 2’nd Amp Syd has built for me and I must say that it is a
dream come true amp for me.
This amp will drive almost any type speaker you could want to use with
it.
It is so versatile and well designed and Syd has built in so many great
features I would like to share them with you.
A built in 15-second timer delays application of B+ voltage to allow the
tube filaments to heat before the B+ voltage is applied – it is very
gentle on the tubes at start up.
Selectable B+ voltages are available at the flip of the Tube Saver
switches. This lets me use a wide range of power output tubes 6V6, 6L6,
5881, KT66, 6CA7, EL34, KT77, 6550, KT88, KT90, and my favorite the
Sovtek 6B4G. Another major benefit of this is if you leave the Tube
Saver switches in the low position your power tubes should have a very
long life.
Variable application of Negative Feedback from 1dB to 15dB so you can
fine tune the amp for the gain of the output tubes you are using. As an
example I use 1dB of negative feedback for the 6B4G Triodes and around
8dB for KT90 Pentodes.
The driver/phase splitter tubes can be selected by a switch, to use
either the 12AU7/ECC82, 12BH7, ECC99 family of tubes or the 5687, 6900,
7044, 7119/E182CC family of tubes - this gives you great flexibility of
fine tuning the amp when used in conjunction with the different power
output tubes.
This amp was designed with two massive, independent power supplies
incorporating 4 power transformers to ensure each channel has total
separation.
I can use different quads of power output tubes in each channel. For
example - four 6B4G’s in the left channel and four KT90’s in the right
channel. This is really a great setup. I can use 1 dB of negative
feedback for both sets of output tubes and match channel levels with the
input level controls – it really sounds fantastic.
The best part of all is the sound of this amp, in my opinion, when used
with the Sovtek 6B4G’s. It is the best performing parallel push pull amp
built and it has plenty of power to drive my low efficiency planner
loudspeakers.
Syd is a true Master Tube Amp Designer - the sound, build quality, and
flexibility of his amp designs are the best available in my opinion.
Thanks Syd, You have built another wonderful amp for me.
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