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Re: Demagnetizing Tung Sol 6550, Penta KT88s [message #96529 is a reply to message #96527]

Thu, 16 March 2023 22:17

positron
Messages: 96
Registered: May 2020

Viscount

Are the Penta tubes manufactured by Psvane Bruce?

I do not know how old these tubes are.

Supposively not many hours.

Metal band around bottom is hanging/extremely loose on one tube.

No red plating is occuring. I am running the idle plate dissipation
around 30 watts, in triode mode, so includes the screen, and the
output is around 20 watts. So not a real test of the quad given your information.

The bass is shy to me, midrange sounds great though,
but I can't pull the trigger on them. They are loaned
to me, so not out money for this test.

Cheers and thanks for the info Bruce.

pos

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Re: Demagnetizing Tung Sol 6550, Penta KT88s [message #97463 is a reply to message #96412]

Mon, 26 February 2024 21:44

positron
Messages: 96
Registered: May 2020

Viscount

positron wrote on Tue, 21 February 2023 22:45

After more testing/auditioning, I prefer the Pentas over the
Tung Sols. I find the new Tung Sols are still zingy in the highs.
The Pentas are just slightly fuller compared to the Tung Sols.

That is it for now.

Cheers

pos

I am eating some crow now. I just checked and the new Tung Sols (gift years ago) I have been using needed to be demagnetized again. The JJs not so. There is also a difference in the midrange I think I like better with the JJ KT88s.

cheers

pos

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