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Old 13th April 2006, 07:42 AM   #1
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Default Tube Compressor

hi
i m wanted to start building a tube compressor for my bass guitar , i found a compressor schematic with two ecc83 , but it seems it s too old ,and i confused bout the pin connection in first tube , it seems somebody draw it after the original schematic , can anybody tell me , are pin2 and pin1 directly connected to together on first tube ? ( i shown it with a red line around it )

sorry i didn t remember the original link of schematic and the image has no info or copyright on it so i attached the photo ,...

--any idea for another compressor ? any mods ?
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Old 13th April 2006, 08:29 AM   #2
Claus is offline Claus  Denmark
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take a look at
Gyraf

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Old 13th April 2006, 09:45 AM   #3
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thnx for link Claus , they were wat i m exactly lookin for , very great projects , but ! i should forget bout finding components here ,,, specialy input / output transformers ... wish i could build them all ! lol
better stick with the one i posted ..
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Old 13th April 2006, 10:17 AM   #4
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Default Re: Tube Compressor

Quote:
Originally posted by Ahmad_tbp
hi
i m wanted to start building a tube compressor for my bass guitar , i found a compressor schematic with two ecc83 , but it seems it s too old ,and i confused bout the pin connection in first tube , it seems somebody draw it after the original schematic , can anybody tell me , are pin2 and pin1 directly connected to together on first tube ? ( i shown it with a red line around it )
Yes, they are joined together - the first stage is an AC triode amplifier, the second is strapped as a diode to rectify the signal level. The DC output from this rectifier is fed to the next triode as a DC amplifier, the DC output from that is used to bias the final triode, which is used as a variable resistor - making a variable attenuator in conjunction with the 470K.
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Old 13th April 2006, 10:41 AM   #5
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thnx Nigel
sorry i m so new in tubes and almost know nothin bout them ,
so i can use it befor preamp with no problem yeah ?
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Old 13th April 2006, 10:49 AM   #6
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Quote:
Originally posted by Ahmad_tbp
thnx Nigel
sorry i m so new in tubes and almost know nothin bout them ,
so i can use it befor preamp with no problem yeah ?
Assuming the preamp has a high input impedance?, designed for a passive bass - obviously it's designed to feed a valve preamp, but a high impedance solid state one will be fine.

Don't know how well it will work?, and personally I don't see the point in doing it using valves - and it's somewhat cruder than solid state ones (for example only using a half wave rectifier).

My daughters a bass player, solid state all the way! - I don't see any advantage with valves for bass?.
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Old 13th April 2006, 02:43 PM   #7
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Here, use this:
http://geek.scorpiorising.ca/MicPreamp.html

For guitar/bass, change the input resistor to 470K or so.

I'm a bassist and it works just fine
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Old 13th April 2006, 09:24 PM   #8
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hi ,
here s the preamp i m goin to use after it ( ampeg v3 preamp ) :
http://www.drtube.com/schematics/ampeg/v3pre-jp.gif
to Nigel Goodwin : infact most bassists are into solid state cuz they need lotsa power , but wat can ever compare with the warm and alive sound of a tube ? and cuz of that most amps are usin valves for pre and solid state for power , i prefer all tube my self
i built and tried several diffrent solid comb but none of them was satisfy me , so it s time to try a valve comp...
and thnx geek for link at sure i ll try the comp section if i find ic here
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Old 13th April 2006, 09:52 PM   #9
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If I could suggest something- go for LED-photoresistor compression. It has rather long time constant, which is very good for agressive bass line, has good attack and mild compression. As simple as it gets- amplifiaction control goes from a rectifier and feed the LED, and a LED modulates resistance of photoresistor in voltage divider or op-amp circuit.

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Old 13th April 2006, 09:56 PM   #10
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Ha!
I knew it! I knew it!
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