What is the best current production EL34 for a Marshall Plexi?

big mike

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With all the preamp clipping in the Yeti schematic I doubt you'll hear much difference.
 

big mike

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12,309
It might depend on the circuit too. The short base RFT I have sound huge in my Orange R30, much thicker and fuller. I'm wondering if that's because that circuit allows for a lot a low mids to start with?

Again, I really liked bith JJ EL34 and Tung Sol EL34 too before I tried the RFT.
Absolutely the circuit is important. Just cuz something is 'marshally' doesn't mean the power tube will have a large impact on tone.
Most of this stuff is splitting hairs.
 

big mike

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I have a pair of New Sensor Svetlana EL34’s and they are HOT. I have to turn my bias pot all the way to get 71%. And people say they don’t sound good but I like them. I pulled them and put in a set of Marshall branded winged C and that’s what I’m running now. They are a little under power but sound like winged C.
All this studying is for the 100 watt I’m about to start and I want a baseline since I have to get quads.
I heard that the 100 watt will sound better than a 50 watt because it runs a quad.
Dont make a blanket judgment of them all being 'hot' based on the one set you tried in your amp.
 

VICOwner

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1,656
No of course not, just the two I have are smoking. I wished they were cooler. I got them cheap, usually the cheap ones are weak. Not the case here.
The match is spot on too. They at this point pass equal current. The Marshall has no hum! Never before have I had a quieter Marshall. Now the winged C’s are not like that. They are about 4mA apart and have a little hum.
 
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big mike

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12,309
Luckily one resistor change can get your bias pot into a range you like more.
 
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S
I've always just called them Siemens. But I thought they were out of the tube making business long ago; has something changed? Or are we talking NOS?
Siemens/ RFTs usually have like a dimple on too, hence nicknamed "dimpletops" - super stuff!. And yes: they're NOS, probably made during the cold war.
 

hitchcaster

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For $168 a pair, they shouldn't have typos in their ad:
"Shuguang WE6SN7 Plus Vacuum Tube Matched Pair"

The 6SN7 is a pre-amp tube. I'd be pissed if I paid $168 for a pair of pre-amp tubes I couldn't even use.
oh i just picked a random ad.. you could find another seller with no errors in listing for the el34s. and if you bought a 6sn7 you can use it in 12axy slot. just need an adapter and it's a little less gain. they make that as well in this quality version. i tried that but haven't found an amp i like them in better yet.
 

DonP

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oh i just picked a random ad.. you could find another seller with no errors in listing for the el34s. and if you bought a 6sn7 you can use it in 12axy slot. just need an adapter and it's a little less gain. they make that as well in this quality version. i tried that but haven't found an amp i like them in better yet.
Interesting. I see 6SN7's used in hi-fi a lot. I've never had an amp (guitar or hi-fi) that used those octal base pre-amp tubes.
 

big mike

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12,309
Ok; not sure why people don't call them Siemens. Back in the day, my 800s came with them, as well as a 50/50 stereo power amp from that era. They were labelled Siemens.
That's what I always called them as well, but Siemens just contracted them out to RFT.
I switched to calling them RFT here and other places because that's the flow of the conversation.
Great tubes, my last 'quad' is spread into 2 amps I have. When they're dead, I'll go with new sensor svetlanas.
 

big mike

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12,309
This amp is using the NOS Welded plate Tesla's. Tested NOS when I got from Tube tramp, wherever he got them buffed the blue color off with the GT logo. LOL
Sound very good, and very very close to the Siemens/RFT. I ran Svetlana in this first for awhile, and the difference was very subtle. Enough I'd forget what was in there.

 

hitchcaster

Supporting Member
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289
Interesting. I see 6SN7's used in hi-fi a lot. I've never had an amp (guitar or hi-fi) that used those octal base pre-amp tubes.
i have a octal matchless clubman. i tried octal on V1 tweed deluxe recently. i liked the 12ay7 a little better tho. you can get the adapters on ebay and try.
 

DonP

Member
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2,173
i have a octal matchless clubman. i tried octal on V1 tweed deluxe recently. i liked the 12ay7 a little better tho. you can get the adapters on ebay and try.
I have a VT-1000 and an old Heathkit tube tester (not that good with it). Sadly, the VT-1000 sort of "locks me in" to tubes that I can easily test with it.
 




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