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Old 15th December 2014, 10:02 PM   #1
M Gregg is offline M Gregg  United Kingdom
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Default 6080 PSE output Tx?

Has anyone used 6080 in PSE? (ie one tube per channel)

What I'm wondering is suggested primary impedance or output Tx's
Also has anyone any comments of their experience from a sound point of view?

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M. Gregg
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Old 15th December 2014, 10:50 PM   #2
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I have only ever built PP 6080 amps, but have found they sound best run hot and at low voltage. 100mA and 100Vpk is good. For this in PP something around 1K makes a good load.
Unfortunately can't offer specifics on SE.

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Old 15th December 2014, 10:59 PM   #3
M Gregg is offline M Gregg  United Kingdom
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Thank's for the reply,

Yes I have never seen a 6080 run in PSE.. That's what I was thinking I've seen single 6080 in SE.. half tube per channel..I guess a 50 would be about the same power.. heater current would be a bit of a pig..however no more than PP..

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Old 15th December 2014, 11:14 PM   #4
316a is offline 316a  England
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Some sound surprisingly good in SE , very varied in sound between brands and many have mismatched sections (even as NOS) , you need to find ones with fairly good matching . I've currently got an Osram 6AS7 in my amp , Thomson 6080WC are ok but I didn't like Mullard or GE 6080 . You can get away with a HT choke as plate choke and mains toroids as output transformers and get good results . I recommend a driver with lowish Ra . Keep the grid leaks on the 6AS7 150k or less in cathode bias . I've never tried parallel SE so cannot comment on this...

There are other variants such as 5998 and 7236 which have higher mu . The 6528 and 6336 are 'super' versions and probably better to use instead of a paralleled 6AS7/6080 , if you can find any

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Old 15th December 2014, 11:21 PM   #5
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Winged C Russian are the best sounding ones I have heard and come in ST style bottles which are much nicer then the usual 6080's. Dirt cheap direct from Russia.
I too didn't like the Mullards - harsh and grainy sounding. GEC are quite nice with more punch.

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Old 16th December 2014, 12:00 AM   #6
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6H13C are the Russian variants, and a nice tube too. There are also Chinese made 6N5P, 6N13C, 6N33P versions which are cheap as chips.

For regular UK/US made tubes be prepaired to fight over them with Bottlehead Crack owners. 6080, 6AS7G, 2399, 5998, 6520, 7802, 7236, 421A to name a few are all interchangeable.
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Old 16th December 2014, 02:31 AM   #7
multi is offline multi  Australia
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Would the 6080 or 5998 PP work ok with huge c core transformers; I bought them for use with 805 transmitting tubes but the inductance was too low, no bass. 2.2k P--Plate.
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Phil
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Old 16th December 2014, 08:29 AM   #8
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2K2 is a bit high but the low rp will allow plenty of bite on the low inductance.

Shoog
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Old 16th December 2014, 09:57 AM   #9
Yvesm is offline Yvesm  France
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Years ago I commited that . . .
Click the image to open in full size.

More here:

Index of /SE_6AS7

Have fun.

Yves.
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Old 16th December 2014, 03:10 PM   #10
M Gregg is offline M Gregg  United Kingdom
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Thank's for all the information..

I was thinking about the mismatched sections and intended to use an individual CCS in the cathode of each section of the 6080..(chip regulator)

Any thoughts of primary impedance for the parallel tube?
Are we looking at about 1K? I was thinking about Edcore..It doesn't look like they do that low a value in primary impedance.

I was also looking at the old circuit By Tim DP using the ecc88 as a driver..(cascode)

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M. Gregg
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Last edited by M Gregg; 16th December 2014 at 03:34 PM.
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