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Old 1st May 2005, 03:02 PM   #1
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Default Recommended 6SN7 and 6SL7

I bought some Chinese amps with these tubes, changing them is said to improve a lot. I'm more into ECC etc. tubes, so I'll ask your opinions: which should I go for?

Sovtek is quite easy to get for me, are they recommendable?
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Old 1st May 2005, 03:42 PM   #2
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Default 6SN7-reply

Hello fellow Dutch tube-addict !

i fully agree with swapping the Chinese junk to more fine-sounding tubes.

Sorry; i can only speak on the 6SN7. Tube-rolling was EXACTLY the reason why i use this type so often. By simply swapping the 6SN7 "A" to type "B" you can really change the musical presentation without touching the soldering iron. Now that is handy indeed !
The technical data of this tube is very versatile. I found someday a notice that: "the 6SN7 was the tube that the USA made great". Now there are of course always nicer choises but for versatility......
Besided that the 6SN7 is made by a lot of manufactorors and there is a lot to choose from.
I got more than 100 matched 6SN7-pairs here......collecting them for quite some time.

In my set (picture included) you'll find the 6SN7:
- as the input tube of the 833-amp;
- as the main tube of the headphone-amplifier;
- as the output device for the phonostage.

What sound are you look for. Every 6SN7 has of course it's different "sound", but that is obviously very depending on the schematic/components/complete system.

So here are MY remarks, based on MY set.
1. Top:



My advise: get some pairs and start finding what YOU like (which is quite depending of the rest of the chain).

Option: 4 June is at Hoenderloo a "old radio fair". You can bet i'm there. And afterwarts our small audio-club is gathering in Ede at my place to discuss the latest topics, show the goodies from the fair, etc.
You're welcome to join.
I got enough 6SN7's.
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Old 1st May 2005, 03:58 PM   #3
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Default 6SN7-reply 2

Sorry.....was not finished yet !

Top of my list:
- Raytheon VT-231 (box anode)
- CBS-Hytron 5692
- Tung-So, VT-231 (THE roundplate)
- Sylvania 6SN7A
- Sylvania 6SN7W
- Ken-Rad VT-231
- Brimar 6SN7GT (oval plate)
- national Union 6SN7GT


Middle of my list:
- Hytron 6SN7GT
- Raytheon VT-231 (wafer-plate)
- GE 6SN7GTB sidegetter (green markings)
- GE 6SN7GTB sidegetter (Canadian manufacturing)
- GE 6SN7GTB topgetter (Japanese manufaturing)
- Sylvania VT-231 (chromedome)
- RCA 6SN7GTB
- RCA VT-231
- RCA 6SN7GT
- Philips ECC32
- Mullard ECC33
- Valvo 6SN7GT

Bottom:
- Sovtek 6SN7
- National (by Richardson....re-stamped Sovtek)
- Teonex (re-stamped Chinese)
- RCA 6SN7GTB (coin base)

Again: strictly personal. And every tube has it's fevourote settings. Try a 5692 at wrong voltages.....you're treated with screaming highs !

As told before: you're welcome for i will not photograph every different 6SN7 i got ! But i do know i got a lot of them and you're more than welcome to start some tube rolling set here.

Maybe till 4 June (or other date)

Reinout

Prices..
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Old 1st May 2005, 04:44 PM   #4
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Don't know what you mean about substituting ECC types - if you mean 9 pin, then not a good idea - stick to octal, or indeed loctal. Now, if you want some cheap NOS 6SN7 type tubes change the sockets and go loctal with the 7N7. You even have the 7AF7 which is quite cheap and has round plates. Loctal is the cheap way to go with 6SN7 types. Or rewire the octal base, fit a topcap and use VT-99s, that's another nice 6SN7 style tube for not much money. Not a lot of people know that, as Michael Caine would say.....
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Old 1st May 2005, 06:26 PM   #5
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Default ECC32 and ECC33

Hi Andy,

the ECC32 and ECC33 are octal 6SN7-variants. The ECC32 is a straight subtsitute (but note that these beauties gobble away a lot more filament current). The ECC33 has a somewhat more higher gain.

Oh....these are not really cheap.
Included a picture of the ECC32 (2 variants)

Reinout
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Old 1st May 2005, 06:28 PM   #6
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Default ECC33

Andy,

And here's the ECC33 picture. Can be quite handy with it's higher gain and EXACTLY the same pin-out !

2variants: a Mullard and a Philips with respectively black and grey OVAL anodes

Reinout
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Old 1st May 2005, 06:31 PM   #7
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Default 6SN7-pictures

Hi Miniwatt,

after posting your reply i thought: why not make a couple of pictures of some variants.

Just finished 40 different variants. And noted that i have here even more than 100 different pairs....

Reinout
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Old 2nd May 2005, 12:57 AM   #8
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Default Howdee 211 mate

check your email
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Old 2nd May 2005, 02:23 AM   #9
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I have a Chinese "Music Angel" 845SET and my experience is the same as yours.

Pulling the 6N9P first tube (used for SRPP input) and replacing with NOS Sylvania 6SL7 made a significant improvement.
BUT
Pulling the 6N8P driver (two sections paralleled in CC stage) and replacing it with NOS Sylvania 6SN7 made a HUGE improvement.

The Sylvania tubes were just what I happened to have on the shelf at the time.

Cheers,
Ian
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