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Re: New Production Tung Sol 6550, Penta KT88s [message #98039 is a reply to message #97973]

Sun, 06 October 2024 22:36

positron
Messages: 113
Registered: May 2020

Viscount

I performed a check between a used pair of new Tung Sol 6550 with
hundreds of hours on them vs a brand new pair of TS 6550s. All were
part of a matched octet.

I ran each output tube at 30 watt plate dissipation and
6.0 vac, no regulation. The digital measured line voltage has
always been 121/122 vac.

Comparing idle cathode current, the used tubes averaged 68 ma while the
brand new tubes averaged 69.3 ma. Pretty amazing since the side getters
were absorbing internal gas, ~1/3 milky.

Lately, I have dropped the filament voltage to ~5.75 vac to see the
results. So far, working nicely. Will keep informed.

cheers

pos

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[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 Fri, 21 June 2024 17:29
		Re: Demagnetizing Tung Sol 6550, Penta KT88s By: gofar99 on Fri, 21 June 2024 20:50
		Re: Demagnetizing Tung Sol 6550, Penta KT88s By: positron on Fri, 28 June 2024 11:28
		Re: Demagnetizing Tung Sol 6550, Penta KT88s By: gofar99 on Fri, 28 June 2024 20:46
		Re: Demagnetizing Tung Sol 6550, Penta KT88s By: positron on Tue, 02 July 2024 00:14
		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
		Re: New Production Tung Sol 6550, Penta KT88s By: Wayne Parham on Tue, 02 July 2024 13:50
		Re: New Production Tung Sol 6550, Penta KT88s By: positron on Tue, 02 July 2024 23:41
		Re: New Production Tung Sol 6550, Penta KT88s By: gofar99 on Wed, 03 July 2024 11:09
		Re: New Production Tung Sol 6550, Penta KT88s By: positron on Sun, 07 July 2024 20:26
		Re: New Production Tung Sol 6550, Penta KT88s By: positron on Wed, 28 August 2024 23:11
		Re: New Production Tung Sol 6550, Penta KT88s By: positron on Sun, 06 October 2024 22:36

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Sonic Difference between New Tung Sol 6550 vs KT120 vs KKT150

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