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Re: Demagnetizing Tung Sol 6550, Penta KT88s [message #97810 is a reply to message #97806]

Fri, 28 June 2024 20:46

gofar99
Messages: 1949
Registered: May 2010
Location: Southern Arizona

Illuminati (5th Degree)

Hi, I get asked all the time on the Oddblock amps as to how often the tubes should be replaced. I used the original tubes (blue glass JJ KT88s) for 12 years in class A U/L at 36 watts dissipation (A+S) and they still were sounding fine and tested good. My estimate was nearly 8000 hours. Well beyond the 2K or so they spec for. Since I switched to the KT120s in the amps I figure they will last to the next century at about 25 watts dissipation. That BTW is a sweet spot in the sound, not done to be be frugal. The preamp and drivers either NOS Phillips JAN 5751 or NOS JAN Sylvania 12SL7s will likely never need replacing. In the past 15 years I have had one fail due to an internal short but none ever tested or sounded bad. BTW I suspect the Blue JJs were probably not no lead but I could be wrong. Sometimes the socket is the issue and not the tube. I normally use Belton ones. They can be testy as they grab the tube really hard though and can make it difficult to get out. I now always use SMPS for heater power that are well filtered, isolated and closely regulated.

Good Listening
Bruce

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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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