AudioRoundTable.com: Thermionic Emissions » New Production Tung Sol 6550, Penta KT88s

Home » Audio » Thermionic Emissions » New Production Tung Sol 6550, Penta KT88s (Concerning Audio Quality)

Show: Today's Messages :: Navigator :: Polls
E-mail to friend

Re: New Production Tung Sol 6550, Penta KT88s [message #96292 is a reply to message #96284]

Sat, 21 January 2023 18:24

positron
Messages: 97
Registered: May 2020

Viscount

Evidently no one uses them?

My testing has found both tubes to be rather thin, anemic sounding compared to JJs and Winged Cs.

So I demagetized both, using my 100 watt soldering gun magnetic field (gun windings), and both tubes became fuller than the JJs and Winged Cs. Quite a sonic change. The new Pentas just slightly fuller than the new Tung Sols.

When the tubes are manufactured, induction heating of the plate removes gases. Evidently, the switch/field is simply flipped, rather than gradual field removal.

So when one purchases a new output tube, what you purchase and hear is not necessarily what the tube sounds like after being demagnetized.

One could probably use a dryer, a motor, anything that produces an AC magnetic field. Simply rotate each tube around the AC device field, and then gradually distance the tube from close to 3 feet or more from the device, and power off the device.

cheers

pos

Report message to a moderator

[Message index]

		New Production Tung Sol 6550, Penta KT88s By: positron on Wed, 18 January 2023 23:01
		Re: New Production Tung Sol 6550, Penta KT88s By: positron on Sat, 21 January 2023 18:24
		Re: New Production Tung Sol 6550, Penta KT88s By: Wayne Parham on Sat, 21 January 2023 20:48
		Re: New Production Tung Sol 6550, Penta KT88s By: positron on Sat, 21 January 2023 21:33
		Re: New Production Tung Sol 6550, Penta KT88s By: positron on Sun, 22 January 2023 17:28
		Re: New Production Tung Sol 6550, Penta KT88s By: gofar99 on Mon, 23 January 2023 20:25
		Re: Demagnetizing Tung Sol 6550, Penta KT88s By: positron on Mon, 23 January 2023 22:12
		Re: Demagnetizing Tung Sol 6550, Penta KT88s By: positron on Tue, 21 February 2023 22:45
		Re: Demagnetizing Tung Sol 6550, Penta KT88s By: positron on Mon, 26 February 2024 21:44
		Re: Demagnetizing Tung Sol 6550, Penta KT88s By: positron on Thu, 16 March 2023 15:30
		Re: Demagnetizing Tung Sol 6550, Penta KT88s By: gofar99 on Thu, 16 March 2023 21:28
		Re: Demagnetizing Tung Sol 6550, Penta KT88s By: positron on Thu, 16 March 2023 22:17

Previous Topic:	Class A, AB1, B, C Operation/Modes
Next Topic:	Update on Previous Info on Oddwatt Amp issue

Goto Forum:

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sun Apr 28 13:55:02 CDT 2024