NOS RFT Tubes

[surfnorthwest]

Been watching for awhile for some NOS RFT's to come availible, these tubes are killer in plexi type amps if you want a darker sound. I wouldn't use them in the VM but I got them for my new 50 watt 72 JMP50 clone being built. Heck of a good buy at $28 each for these unused tubes

http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... 0300067249

[HappyBlues]

They were made about 100km from where I live. They are not russian. You can see "Made in Czechoslovakia" on the box... That was a state formed of today Czech and Slovakia. Former Soviet Union. Nowadays JJ Electronics makes tubes on some of machines from that factory. But they claim themselves they cannot make such a quality tubes otherwise they'll be too pricey and noone would buy them.

I knew a guy who had a bunchload of those. Prolly hundred or more. He worked in old Tesla fabrique. But he wouldn't sell them. And I wouldn't bother to buy them from him. He would rip off his grandmother with peace of mind.

[surfnorthwest]

They are a great tube, high gain for sure and very articulate.

[HappyBlues]

after fall of soviet union there were demolished quantities like ten's of train wagons full of tesla tubes. now if anyone was an asshole, the guy who did it was.

[LivewireBlanco]

after fall of soviet union there were demolished quantities like ten's of train wagons full of tesla tubes. now if anyone was an asshole, the guy who did it was.

[DeanM]

well at the time they werent NOS obviously they wer just N and at the time transister technology would have been advancing electronics so even if the person/people knew what it was they were destroyin then they prob wudn have known how valueable they would come to be!! im sure there was a time where some even thought tubes would become worthless!! as far as electronics in computers and such!

but still....that sucks!!

[DeanM]

haha i just noticed...the diagram on the sides of the boxes, arent they the schematics for pentodes? even tho ecc83 are triodes!!

[surfnorthwest]

haha i just noticed...the diagram on the sides of the boxes, arent they the schematics for pentodes? even tho ecc83 are triodes!!

Heck I don't know, all I know is they are some very nice sounding tubes. I was playing with them in my Metro 100w 69 Superlead switching the RFT with the Halo Getter Mullard that is currently in there, and while the tone does change to more high gain with the RFT I prefered the Mullards in it.

Now in my 72 JMP 50 clone from Granger the RFTs are bad ass, they are paired with a set of JJ KT77s and this amp is instant brown sound without question. Like I said they are very articulate like a Mullard but has more gain for sure.

If they are Triode or a Pentode I don't know since I never learned the difference, I only understand that one has more active electrodes than the other. How would I tell?? Here are a couple of pics of some extras I bought for the future.

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[DeanM]

haha i just noticed...the diagram on the sides of the boxes, arent they the schematics for pentodes? even tho ecc83 are triodes!!

Heck I don't know, all I know is they are some very nice sounding tubes.
If they are Triode or a Pentode I don't know since I never learned the difference, I only understand that one has more active electrodes than the other. How would I tell??

well the schematic on the box is a pentode but is prob just art work!! i was only pointin out that it has no relation to the actual tube. i didn mean you have the wrong type or anytin! cos they wouldnt work!!

an Ecc83/12ax7 is a dual triode (two triodes in one package) a triode is so called cos it has three active electrodes; cathode, anode and grid. pentode is so called cos it has 5 active electrodes. cathode, anode, grid, screen and suppressor.

ya wont need this info but it might be interesting.
12ax7/ecc83 - Dual triode
12au7/ecc82 - Dual triode
12at7/ecc81 - Dual triode
El34 - Pentode
6l6 - beam tetrode
kt66 - beam tetrode

[surfnorthwest]

OK once again you are the smart guy around here Kind of freaked me out a bit as I did not know what you were saying in the original post. All I know is the tube seller I bought them from came recommended from some guys at the Metro board as the one to get new RFTs from. I am so careful anymore when I buy these old NOS tubes because of all the scam artist out there.

I have not tried the RFTs in my VM because once again the way it sounds now I just don't want to change anything with it, I have a early Robin Trower tone simply nailed with this amp and my effects and the tone is killer. I will post a track in a couple of days I am almost finished with so you can see what I mean.

Also when I get some time next weekend I will take some shots of my new 50 watt plexi I just got from Granger along with a few clips. That one has the RFTs in it. :pimp

[HappyBlues]

As some ppl might find it funny and/or interestine this is what writing on the tube box says:
"Tesla Roznov n.p." (company) in "Roznov pod Radhostem" (city) gives a warranty on tubes for a customer, that product won't change it's electrical properties, set by technical conditions for 12 months from the sales day. Malfunctions, that are not from production (burnt wires or other components, overload, mechanical damage, etc.) are not part of warranty. Warranty is to be applied in sales organisation with this box and treasury check, where has to be the part number and date of sale.

bad old comunist times :)

[DeanM]

OK once again you are the smart guy around here Kind of freaked me out a bit as I did not know what you were saying in the original post. All I know is the tube seller I bought them from came recommended from some guys at the Metro board as the one to get new RFTs from. I am so careful anymore when I buy these old NOS tubes because of all the scam artist out there.

Also when I get some time next weekend I will take some shots of my new 50 watt plexi I just got from Granger along with a few clips. That one has the RFTs in it. :pimp

Oops! sorry for freakin ya out surf!! i shudv been clear on it that i was just amused by it!! :Bounce

thats true....can never be too careful!! and if im ever in the market for some of those il prob need yer advice!!

You got the 72 JMP??? :woot :woot how is it?? had much time to give er a blast?? cant wait ta hear that!! that vid with all the van halen clips sounded fuckin awsome!! from the whole site i picked that and the E35 as my favourites!! and i cant believe the prices compared to metro amp!!

[DeanM]

As some ppl might find it funny and/or interestine this is what writing on the tube box says:
"Tesla Roznov n.p." (company) in "Roznov pod Radhostem" (city) gives a warranty on tubes for a customer, that product won't change it's electrical properties, set by technical conditions for 12 months from the sales day. Malfunctions, that are not from production (burnt wires or other components, overload, mechanical damage, etc.) are not part of warranty. Warranty is to be applied in sales organisation with this box and treasury check, where has to be the part number and date of sale.

bad old comunist times :)

thats cool!! i think its cool when people can speak more than one language!! i can only speak english... but i know some french and some russian. i could hold conversation in french and maybe for a little while in russian! i started learnin russian last september but then started back to college so didnt have time after that!! maybe il get back to it this summer!!

[surfnorthwest]

Good information Freesun, and to think a cowboy conservitve such as myself would by old communist tubes

Well it doesn't matter because they sound great and am happy I was able to secure a few for the future.

[surfnorthwest]

Hey dean not only are his prices great but his build are top shelf. This 50 watt plexi is the real deal and out of the box it has killer plexi tone. Curt is also fantastic to work with, he keeps you up to date on your build and takes the time to let you know options you can do. The real impressive thing on this build is how well the Master volume works and the transformer he used.

Again I will post some pics this weekend.