Electro-Harmonix

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September 19, 2014 at 5:56 am in reply to: Datasheet for KT 88 Tube #120235

puretube
Member

http://www.newsensor.com/pdf/electro-harmonix/kt88eh.pdf
http://www.newsensor.com/pdf/sovtek/kt88-sovtek.pdf
http://www.newsensor.com/pdf/genalex/kt88-genalex.pdf
http://www.newsensor.com/pdf/svetlana/kt88-svetlana.pdf

May 26, 2014 at 5:38 am in reply to: 12AY7 Mic Preamp power adapter question #119999

puretube
Member

Yes, the wire order doesn`t matter.
But: be aware that the power jack needs to be ISOLATED from the chassis!
The 12V AC power jack is the same for all countries.
Those are also known as DIN loudspeaker sockets.
Better attach such a DIN-plug to your power-supply!

April 20, 2013 at 4:44 am in reply to: HELP! Changed Pot on Small Stone, now I have just Ground Hum! #118950

puretube
Member

How about mounting the jacks back into the box, so that all ground-connections indeed do get connected?

January 18, 2013 at 10:07 am in reply to: Congratulations to Mike Matthews #118681

puretube
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CONGRATULATIONS !!!

January 12, 2013 at 10:17 pm in reply to: US English Muff’n with UK Power Supply #118649

puretube
Member

Confirming all 3 are the correct ones…
the HotRox pic, if you look closer at the upper of the (mirrored) plug-images
shows that it indeed has a flat and a round pin…

Those 2-pole “DIN” plugs/jacks were/are being used for speaker-connections in HiFi-equipment
and car-radios in Germany since the `60s…
They belong to the “DIN”-family of connectors that also provides the standard
“MIDI” connectors…

http://de.wikipedia.org/wiki/DIN-Stecker

E-H uses those plugs to prevent the user from plugging in
a DC supply by accident…

March 17, 2012 at 6:55 pm in reply to: New Pedal info leaked: Superego, Tone Tattoo, Crying Tone, Volume, Talking, Expression, & Pan, #117134

puretube
Member

http://www.themadape.com/Electro_Harmonix_Tone_Tattoo_Multi_Effects_Pedal_p/ehx-tonetattoo.htm
http://www.themadape.com/Electro_Harmonix_Volume_Pedal_p/ehx-volume.htm
http://www.themadape.com/Electro_Harmonix_Pan_Pedal_p/ehx-pan.htm
http://www.themadape.com/Electro_Harmonix_Expression_Pedal_p/ehx-expression.htm
http://www.themadape.com/Electro_Harmonix_Talking_Pedal_p/ehx-talking.htm
http://www.themadape.com/Electro_Harmonix_Crying_Tone_Wah_Pedal_p/ehx-cryingtone.htm

March 17, 2012 at 6:50 pm in reply to: New Pedal info leaked: Superego, Tone Tattoo, Crying Tone, Volume, Talking, Expression, & Pan, #117133

puretube
Member

http://www.themadape.com/Electro_Harmonix_Crying_Tone_Wah_Pedal_p/ehx-cryingtone.htm

March 17, 2012 at 6:48 pm in reply to: New Pedal info leaked: Superego, Tone Tattoo, Crying Tone, Volume, Talking, Expression, & Pan, #117132

puretube
Member

http://www.themadape.com/Electro_Harmonix_SuperEgo_Synth_Pedal_p/ehx-superego.htm

July 9, 2011 at 7:42 am in reply to: Double Muff Pedal help please #115845

puretube
Member

to the upper of the two red lugs of the power jack in the pics above…

EDIT: arghhh – so I didn`t need to open it up, make pix, and upload`em?

October 28, 2010 at 7:14 pm in reply to: volume lost on pulsar variable tremolo #112282

puretube
Member

Those ICs will not help overcoming the (perceived!) volume-drop,
but of course you can inquire @ http://www.burrbrown.info/
whether they provide any chips that meet the specifications
of the ones you found in your E-H PULSAR.

October 28, 2010 at 6:32 am in reply to: volume lost on pulsar variable tremolo #112277

puretube
Member

http://acapella.harmony-central.com/showpost.php?p=31155176&postcount=23

October 26, 2010 at 9:11 pm in reply to: The Worm – Schematic anyone? #112211

puretube
Member

Here`s your direct link:
http://www.diystompboxes.com/smfforum/index.php?topic=73245.msg601766#msg601766

August 9, 2010 at 6:48 am in reply to: Pulsar rate slows/stops #110782

puretube
Member

1K linear…

July 23, 2010 at 7:41 pm in reply to: FLANGER HOAX MINI-SWITCH ACTING UP #110454

puretube
Member

I`m not so sure whether that stem can be screwed out…
but surely the problem is a mechanical one.
If someone is going to take the PCB out of the box anyway,
it is better to replace the complete switch with an equivalent one.
“Playing” around with the built-in switch might damege the copper-traces on the board.
Too much strain on the board is not good!

(A verstile technician could also put the switch into the OFF-position,
and install a screwable ON/OFF/ON-switch somewhere else in the chassis,
and solder that new one with flexible wires to the relevant PCB-pads…)

July 23, 2010 at 7:30 pm in reply to: Can cable length affect the response of an expression pedal? (H.O.G. content) #110453

puretube
Member

Hi Gustavo:
the M-Audio exp-pedal has a linear pot (i.e. the rotating variable resistor that is being turned
when you rock the footpedal forth and back)
which means that its resistance and hence the control-voltage (CV) increases linearly from zero to maximum according to the travel (rotation) of the pedal.
This is good most of the time for CV Expression-pedal inputs.

The Boss pedal is a volume-pedal which has a logarithmic pot
which means that when it is used for varying the CV, it will vary its resistance (and hence the CV) very very slowly in the beginning of the travel, and then very fast towards the end.
This is good for audio-signal Volume-controlling.

Now, depending on how the Tip, Ring, and Sleeve of the TRS-cable are wired,
this can mean that the CV seems to “jump” from min to max or vice versa
either near the toe-down or the heel-down position of the volume-pedal.

The resistance-curve of a pot (linear or logarithmic) is called “taper”,
while the logarithmic taper is often also called “audio”.
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