Scavenged some toobz (suggestions?)

[vendettav]

hey guys . foudn 3 toobz in the tools closet... they'er old soviet tubes. they seem to be new tho. 2 have 6F1P (in russian letters) on them, have 9 pins. and one is thinner and smaller a bit and has 7 pins and has 6J (that russian ">|<" letter) sop 6J5P

any ideas what these are? how can I test them and where can i use them? i thought of Valvecaster http://www.diystompboxes.com/smfforum/index.php?topic=63479.0 but this is my first time im dealing with tubes, what if it doesnt work, what shall i do? how shall i go adapting the schem for my tubes?

[vendettav]

update i found that "The Russian 6F1Pi is a triode+pentode tube and is equivalent with the European ECF80."
a data sheet http://www.mif.pg.gda.pl/homepages/frank/short/054/3/310.pdf
still doesnt make much sense to me. i'd like to use it in a pedal.. you know overdrive or if i could at least use it as a clipping diode? idk

[petemoore]

  The Russian 6F1Pi is a triode+pentode tube and is equivalent with the European ECF80.
 I guess the ECF80 is equivalent to the 6F1Pi too !
  It can be tricky to find tube information like even the equivalent to a data sheet's first paragraph/chart.
 Otherwise triode/pentode sounds like a tube you'd find in a frugal amplifier design.
  If you know what the pins connect to and can find the Max plate voltage and heater supply voltage, the triode probably works similarly to a triode of similar V specs.
  The pentode is more complicated, see: RCA tube manual.

[vendettav]

well ok makes sense... im now dwnloading the book.
mmm anyways may be there's some shorter and more narrowed (on guitar) article about tubes??

[vendettav]

update... i found this
and this
http://www.r-type.org/exhib/aaa0051.htm

now who can tell me about what is what and also which pin represents what?

sorry if this sounds stupid, but im trying to get my way around with tubes

[iccaros]

you could try that tube in my linear Pedal....

but pins

Pin 1 Plate (anode) of the triode
Pin 9 Grid Triode
Pin 8 cathode of the Triode
Pin 4 and Pin 5 heater

Pin 6 Plate Pentode
Pin 3 Screen 2 of pentode
Pin 2 Screen 1 of pentode
Screen 3 is connected to cathode (this is a common thing)
pin 7 cathode pentode

So simple design to get started

12 volts in (b+)
Put a 100K from pin 1 to B+
Place a .1 uf cap between pin 1 and pin 2

Place a .022 cap between pin 9 and audio input
Place a 1m resistor from Pin 9 to ground

Pin 8  1K to ground

Pin 3 to b+
Pin 6 connect 100K to B+
Pin 6 .1 uf to 250K Audio pot
Audio out of wiper on audio pot
Pin 7 ground

pin 4 to 13ohm >5watt resistor to B+ (this tube wants 6.3 volts and pulls .450 amps so you need to drop 5.7 volts from the 12 = 12.6 ohms (5.7/.450)
as for power .450 X 12.6 = 5.67 watts...

I am not saying this would necessarily sound good as all numbers are pulled from my 4th point of contact.. but it should make some noise you could adjust from there.


If you had a single triode tube you could build a little guitar amp from this.. or you could use a mosfet to be the first stage..
Pin 5 ground

[vendettav]

thanx Iccaros. that makes sense

jsut a little question. so a i need to get a 13ohm resistors with higher than 5watt power?
and mm what do i do with pin 5? leave it unconnected??

also what is this a triode into pentode thing or.. ??

[iccaros]

pin 5 to ground

This is just a simple test to pass audio and see what this tube can give you in a pedal, its almost like a valvecaster.
once you have it passing audio, you can make some changes, add more voltage.

This should give a clean boost with a little overdrive, But I have not tried a single gain stage to a pentode before..

[iccaros]

thanx Iccaros. that makes sense

jsut a little question. so a i need to get a 13ohm resistors with higher than 5watt power?
and mm what do i do with pin 5? leave it unconnected??

also what is this a triode into pentode thing or.. ??

the resistor is to drop the 12 volts to 6.3. The tube heaters will pull 450 ma so that will flow through the resistor.
you could use a lm7805 with a heat sink to get 5 volts for the heater (close enough to 6.3 ) . you would need a heat sink.

The 13ohm is just what the math came up with, with tolerances of 10% gives you could use the closest value..

you could make a very low wattage amp moving to 150volts.. you may get 1watt. This is a TV tube, looks like a Russian version of the 6AF11 minus one triode. I'll post you two designs to try, put them on bread board for testing so you can change out quickly..

[iccaros]

Low wattage amp
1/2 watt

I found people state that this tube is similar to the 6BL8

[vendettav]

thanx mna, much appreciated. i think i wont get into the amp thing to prevent dealing with the transformers... really hard to get here. and from abroad they're kinda expensive.. well never mind, i'll jsut try the idea you said for the booster, let's see if i'll make any sound at all. now to go get the resistor

[petemoore]

  Pretty much any OT with usable ratio will 'work', shoot maybe even a PT..
   Sometimes they're found mounted on the frame of blown speaker baskets too.
  If you can 'get through' the RCA Tube Manual reads, with a bit of 'design-around-the-glass bottle' you can pretty much figure out how to hook up any tube.

[iccaros]

thanx mna, much appreciated. i think i wont get into the amp thing to prevent dealing with the transformers... really hard to get here. and from abroad they're kinda expensive.. well never mind, i'll jsut try the idea you said for the booster, let's see if i'll make any sound at all. now to go get the resistor

you can try the second as a booster also @ 12 - 24volts if the first does not work..

[vendettav]

nice! seems like i've got some nice basis to work with 
i'll still try looking for some 12AU7 or AX russian substitutes...

just the thigns are hard here cause like no tube dedicated hardware available. you can get some tubes from the flea market but expect them to be old and whatnot.. what's there is there you know

[vendettav]

ok so the thing doesnt work, ima try with the other tube i have (same thing) but meanwhile... it's a pain in the ass to hook up the tubes without a socket... anyways mmm waht i get is just the hum from my unfiltered powersupply, but if i take the hum off the pin 4 (heater) the hum gets quiter... and the resistor on teh heater got warm (not hot) soim guessing the tube's pulling some current. but it doesnt give me anything out. i've tried probing the input to the other parts and only at the end of the chain (at that output cap) i got the signal. what is going on? is it the tube that's dead?

[vendettav]

and also i just tried measuring the votlages and when i connect the thign to the heater the voltage from 10 (non regulated power supply) goes down to 3.something (all around the B+) and the heater voltage is 1.something. now wonder why it doesnt work but what's with the voltaeg drop?  i am using a 10Ohm 10 watt resistor for the heater.

[iccaros]

Resister value was calculated for 12volts if you are going from 10
you need 6.3 so you need to drop 3.7 volts math 3.7/.450 = 8.2 ohm



Also it looks like you are drawing more current than the power supply can handle..

you will need a 12volt 1amp supply

first just put voltage to the heaters, make sure they work..

[vendettav]

Resister value was calculated for 12volts if you are going from 10
you need 6.3 so you need to drop 3.7 volts math 3.7/.450 = 8.2 ohm

well i originally went with 9v but i also tried 12v (ive got that variable power supply) but damn i didnt measure with the 12v...

you will need a 12volt 1amp supply

yeah mine is 3-12v (switchable) 1amp supply

first just put voltage to the heaters, make sure they work..

ok i'll do so

[iccaros]

If you can not get sockets I can send you some.. I don't know how long it will take to get to you.. but I'll send you some..

i can get 4 of these on ebay for as little as $16... so I may order them and see if I can help you better.. It may be fun..

[iccaros]

found a better datasheet.
http://oldradio.qrz.ru/tubes/russian/detail/6f1p_2.shtml

I don't read Russian, but Google translate in Chrome does a good job