RE: Ultralinear patent

Posted by tube wrangler (M) on September 15, 2023 at 17:32:51

In Reply to: RE: Ultralinear patent posted by Tre' on September 14, 2023 at 14:32:20:

Pentode types: There will always be a time-delay
between plate and G2-- unless this
anomaly is corrected for-- a pentode
will never become a "good" triode no
matter how triode-connected or UL connected it is.

However-- there is a correction that
can be applied by designing the output
trans for the brand tube you are going to use--
(UL connection), OR by
designing a separate G2 supply that
applies the correction there-- or BOTH as I
am currently doing..

I am pursuing this KT88 thing
lately and over the last 2 years
I have made a few changes, as needed,
decided by direct comparison against
my own and other pure DHT triode amps.

Incidentally this pentode thing started
originally by using the KT-150.

I soon found SOME KT88 types that are
better built (don't rattle like a tin can from
crappy construction), and sound really good,
so the KT-150 quickly became an also-ran.

When a KT88 is run correctly, and
at the right plate current, and corrected
as stated (above), it can and does
sound just like the DHT triode amp with
some delightful additions:

(1) It has more bottom-end "crunch" and
layering of music, it has a deeper soundstage,
it has less hum (if both tube types have balanced A.C.
operated filament).

(2) The top-end extends further. In daily use, on
all kinds of music and sources such as Blu-Ray
movies, etc., this isn't needed, as the pure
triode DHT has enough of that anyhow, when used
with excellent parts.

(3) Once perfected, the two topologies sound
very much alike-- in practical usage terms--
but they won't measure alike....

All in all-- I love them both, and so do the
guys I know who are building both. All are SE
amps.

-Dennis-

This post is made possible by the generous support of people like you and our sponsors:

Follow Ups Full Thread

Topic - Recommend driver for SE KT88 - Pabloaguas 12:34:36 09/12/23 (29)

EL84... :) - PakProtector 05:43:47 11/16/23 (0)

You could run that tube in ultralinear mode - Ralph 09:56:29 09/14/23 (25)

RE: You could run that tube in ultralinear mode - Tre' 13:33:14 09/14/23 (24)

RE: You could run that tube in ultralinear mode - Best audiotransformers 11:59:34 08/22/24 (0)

you would short stroke the driver in an UL amp and never - elblanco 20:14:09 09/20/23 (1)

RE: you would short stroke the driver in an UL amp and never - Tre' 08:09:08 09/21/23 (0)

Ultralinear patent - Ralph 14:00:22 09/14/23 (20)

RE: Ultralinear patent - Tre' 14:32:20 09/14/23 (19)

RE: Ultralinear patent - tube wrangler 17:32:51 09/15/23 (2)

There is merit and validity in what Dennis says here, Sigh, nothing beats empirical knowledge!~nT - Cleantimestream 10:30:35 10/29/23 (0)

Dennis, this guy is looking for you - Tre' 19:56:18 09/16/23 (0)

RE: Ultralinear patent - Ralph 08:00:47 09/15/23 (6)

RE: Ultralinear patent - Tre' 14:39:39 09/15/23 (4)

RE: Ultralinear patent - Ralph 08:23:01 09/27/23 (3)

these UL curves, from your link, are the same as the ones I posted. - Tre' 09:35:55 09/28/23 (1)

RE: these UL curves, from your link, are the same as the ones I posted. - Ralph 09:57:51 09/28/23 (0)

RE: Ultralinear patent - grindstone 20:13:30 09/27/23 (0)

40% Just what Acro claims is optimum - Tre' 13:32:19 09/15/23 (0)

tung sol 6550 UL plate curves at the recommended 40% tap - Tre' 15:58:19 09/14/23 (0)

From a Acro pamphlet on UL operation showing different tap values - Tre' 15:22:58 09/14/23 (7)

Circling back to the OP - Pabloaguas 12:19:33 09/18/23 (6)

RE: Circling back to the OP - Paul Joppa 22:06:29 09/20/23 (1)

RE: Circling back to the OP - PakProtector 09:01:18 11/20/23 (0)

Try the Russian 6E6P or perhaps the 6E5P - coronadope 14:41:58 09/18/23 (2)

RE: Try the Russian 6E6P or perhaps the 6E5P - coronadope 14:50:36 09/18/23 (1)

RE: Try the Russian 6E6P or perhaps the 6E5P - Tre' 17:18:43 09/18/23 (0)

RE: Circling back to the OP - Tre' 13:50:14 09/18/23 (0)

RE: Recommend driver for SE KT88 - Paul Joppa 08:28:32 09/14/23 (1)

RE: Recommend driver for SE KT88 - tube wrangler 00:29:04 08/21/24 (0)

Follow Ups

RE: Ultralinear patent - tube wrangler 17:32:51 09/15/23 (2)

There is merit and validity in what Dennis says here, Sigh, nothing beats empirical knowledge!~nT - Cleantimestream 10:30:35 10/29/23 (0)

Dennis, this guy is looking for you - Tre' 19:56:18 09/16/23 (0)

RE: Ultralinear patent

Post a Message!