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 (3) VOX Guitar Amp. Setup I use
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stuartwbuchanan
Platinum Member

USA
2190 Posts

Posted - 05/06/2013 :  6:53:51 PM  Show Profile  Visit stuartwbuchanan's Homepage  Reply with Quote  [Reply to Topic]  | [Reply w/ Quote]
Using (3) VOX Amps. at the same time provides a "Concert Sound Effect" instead of using a single Amp. This is described at my flicker Site. All Amps. use real Mullard Tubes mostly Vintage made in GT. Britain. I use a VOX4, another VOX4, and a VOX15. I am still tweaking the VOX-3 setup but it works very well and you can crank the VOX4s into British Bark distortion without disturbing the neighbors. See the pictures and description at my flicker site: http://www.flickr.com/photos/mavericmanic/sets/72157627671591935/



Stuart

http://www.youtube.com/user/InventorDesigns/about
https://plus.google.com/112885889121395946070/about

Edited by - stuartwbuchanan on 06/02/2013 8:54:10 PM
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garrigus
Moderator

USA
14512 Posts

Posted - 05/07/2013 :  09:13:48 AM  Show Profile  Visit garrigus's Homepage  Reply with Quote
Nice setup, Stuart!

Scott

--
Scott R. Garrigus - http://www.garrigus.com
* Cakewalk SONAR Video Tutorials: https://www.youtube.com/user/ScottGarrigus?sub_confirmation=1
* Author of the Cakewalk Sonar and Sony Sound Forge Power book series: http://garrigus.com/?PowerBooks
* Publisher of the DigiFreq music recording newsletter: http://www.digifreq.com/
* Publisher of the NewTechReview consumer tech newsletter: http://www.newtechreview.com/
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stuartwbuchanan
Platinum Member

USA
2190 Posts

Posted - 05/07/2013 :  1:26:24 PM  Show Profile  Visit stuartwbuchanan's Homepage  Reply with Quote
Thank you Scott! Still tweaking it a bit but it is getting there.

Stuart

http://www.youtube.com/user/InventorDesigns/about
https://plus.google.com/112885889121395946070/about
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stuartwbuchanan
Platinum Member

USA
2190 Posts

Posted - 05/07/2013 :  3:15:51 PM  Show Profile  Visit stuartwbuchanan's Homepage  Reply with Quote
Just bought and tested Morley volume pedal for my VOX-3 setup.

Specs: Electro-Optical circuitry and audio taper allow smooth, studio quiet volume control. Minimum Volume control is now foot switchable, includes LED indication and has an easy access battery compartment.

Remarks: Needs some adjustment for audio taper volume sensitivity. Also I will add about (5) additional 1/4" output jacks to run signal cables to multiple Amp. inputs for playing through different Amps. simultaneously. Works very well for Volume Swelling.

Stuart

http://www.youtube.com/user/InventorDesigns/about
https://plus.google.com/112885889121395946070/about
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stuartwbuchanan
Platinum Member

USA
2190 Posts

Posted - 05/07/2013 :  4:24:16 PM  Show Profile  Visit stuartwbuchanan's Homepage  Reply with Quote
When using (2) or more Amps. simultaneously you must consider "Ground Loops" an electronic term meaning more than (1) "Earth Ground" in an Audio System which will cause significant "Hum" which is 50/60 Hz from the power mains. To avoid this condition you need to "Earth Ground" (1) of the Amps. and the other Amp(s) must be "Ground Lifted". Some Guitar Amps. have a switch to do this built in. In my VOX-3 system, I use Ground Lift Adapters so only (2) prongs are plugged into the wall (Hot and Neutral). Only one Amp. is plugged into the outlet with an Earth Ground (a single grounded system). When using (1) Amp. you should use a (3) prong plug for safety reasons and 50/60 Hz noise hum issues. This is a common practice recommended by experts in the Audio Electronics field. This is a technical subject so this link is for those who want to study this more. http://en.wikipedia.org/wiki/Ground_loop_%28electricity%29

Stuart

http://www.youtube.com/user/InventorDesigns/about
https://plus.google.com/112885889121395946070/about
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dirtysteve
Gold Member

USA
1708 Posts

Posted - 05/07/2013 :  8:22:43 PM  Show Profile  Visit dirtysteve's Homepage  Reply with Quote
I like the Morely elop pedals. Had their elop Vol/Wah once that was nice.

Totally different animal than my vintage Vox wah though. The Vox wah is all edgey with a sharp bite. Very cool.

Always fly high
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stuartwbuchanan
Platinum Member

USA
2190 Posts

Posted - 05/07/2013 :  8:33:44 PM  Show Profile  Visit stuartwbuchanan's Homepage  Reply with Quote
The Morley volume pedal I am temporarily replacing for the new one is a Vintage early 1980's Volume analog Potentiometer pedal. Need to refurbish it (scratchy Pot and noisy Stomp switches).

Stuart

http://www.youtube.com/user/InventorDesigns/about
https://plus.google.com/112885889121395946070/about
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stuartwbuchanan
Platinum Member

USA
2190 Posts

Posted - 05/07/2013 :  9:01:10 PM  Show Profile  Visit stuartwbuchanan's Homepage  Reply with Quote
I use 9V Rechargeable NiMH batteries in some of my electronic equipment and in my Volume Pedals. They last a long time between charges up to about 1000 times. They have newer ones now that are 9.6 Volts. 9 V batteries are so expensive (Alkaline) to throw away.

Stuart

http://www.youtube.com/user/InventorDesigns/about
https://plus.google.com/112885889121395946070/about
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dirtysteve
Gold Member

USA
1708 Posts

Posted - 05/07/2013 :  11:11:34 PM  Show Profile  Visit dirtysteve's Homepage  Reply with Quote
The NiMH's have better tone I think.

Just kidding.

Always fly high
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stuartwbuchanan
Platinum Member

USA
2190 Posts

Posted - 05/08/2013 :  12:02:36 AM  Show Profile  Visit stuartwbuchanan's Homepage  Reply with Quote
Very Funny but you are right! A battery is not regulated and as it depletes the Voltage becomes lower which if becomes too low like ex. 7 Volts could affect tone of say an electronic Pedal. You may hear distortion if the circuit does not have enough Voltage to operate correctly. This will affect the tone or not operate correctly so in a way you are correct and different types of batteries have different discharge curves. Sorry for being technical but that is how I am "wired". Get my joke! LOL

Stuart

http://www.youtube.com/user/InventorDesigns/about
https://plus.google.com/112885889121395946070/about
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garrigus
Moderator

USA
14512 Posts

Posted - 05/08/2013 :  07:55:01 AM  Show Profile  Visit garrigus's Homepage  Reply with Quote
Hi Stuart,

Please stop posting links to eBay. This site is not for promoting eBay listings. It's for discussions like this current topic.

I have removed the other eBay link topics that you posted.

Thanks,
Scott

--
Scott R. Garrigus - http://www.garrigus.com
* Cakewalk SONAR Video Tutorials: https://www.youtube.com/user/ScottGarrigus?sub_confirmation=1
* Author of the Cakewalk Sonar and Sony Sound Forge Power book series: http://garrigus.com/?PowerBooks
* Publisher of the DigiFreq music recording newsletter: http://www.digifreq.com/
* Publisher of the NewTechReview consumer tech newsletter: http://www.newtechreview.com/
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stuartwbuchanan
Platinum Member

USA
2190 Posts

Posted - 05/14/2013 :  6:17:58 PM  Show Profile  Visit stuartwbuchanan's Homepage  Reply with Quote
This is what a VOX-4 looks like inside. (1) preamp tube which is Mullard 12AX7 or 12AT7 (lower gain), and a single Output EL84 Mullard tube. This is true Class A since it uses one Output tube always conducting 100% of the cycle. When I received the (2) VOX-4s they had Sovtek Russian tubes which I replace with Mullard manufactured Vintage tubes. I also protected the tubes with my "Automatic Standby Switch" circuit that I designed. The VOX-4s have no Standby Switch so the "Auto-Standby" allows the heaters to warm up to temperature (1 minute) then automatically turns on the High Voltage using a timed relay circuit. This based on some experts in the field (Dave Hunter and Gerald Weber come to mind) prevents Cathode Stripping which can damage tubes when High Voltage is applied too soon when the tubes are not warmed up. This Standby Switch is on the VOX-15 and is a manual switch that does the same thing manually. Links of my photos: http://www.flickr.com/photos/mavericmanic/5348186741/in/set-72157624126613463/ http://www.flickr.com/photos/mavericmanic/5238661594/in/set-72157624126613463/ Disclaimer: This discussion and the pictures here within are for educational purposes only. Do Not try to do this on your own and is only for discussion. High Voltages of 400VDC or more are present in the VOX-4 amps. and can be lethal. A qualified technician should be used to do this kind of work!

Stuart

http://www.youtube.com/user/InventorDesigns/about
https://plus.google.com/112885889121395946070/about
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stuartwbuchanan
Platinum Member

USA
2190 Posts

Posted - 06/01/2013 :  6:58:01 PM  Show Profile  Visit stuartwbuchanan's Homepage  Reply with Quote
Upgraded the VOX-15, 15 Watt with (2) matched pair Mullard EL84s. This completes the (3) Preamp and (2) Output tubes so all (5) tubes are Mullard Vintage Made in Gt. Britain. This amp came with all Chinese tubes. Here is the link of (2) pictures of the EL84 Output tubes: http://www.flickr.com/photos/mavericmanic/sets/72157627671591935/

Stuart

http://www.youtube.com/user/InventorDesigns/about
https://plus.google.com/112885889121395946070/about

Edited by - stuartwbuchanan on 06/02/2013 8:53:23 PM
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dirtysteve
Gold Member

USA
1708 Posts

Posted - 06/02/2013 :  02:13:31 AM  Show Profile  Visit dirtysteve's Homepage  Reply with Quote
Stu, how do you like the AC15C1?

Always fly high
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stuartwbuchanan
Platinum Member

USA
2190 Posts

Posted - 06/02/2013 :  03:18:51 AM  Show Profile  Visit stuartwbuchanan's Homepage  Reply with Quote
quote:
Originally posted by dirtysteve

Stu, how do you like the AC15C1?

Yes this is the model I have in Black Tolex. It is a well built Amp. inside and (2) channel with Top Boost, the VOX Classic circuit to improve the High end. I did not like the Chinese 12AX7s and EL84s so I spent some money on Mullard Vintage tubes and got that Classic British sound. It is completely Mullard now (Made in Great Britian) Not Reissue Russian Mullards but Real Mullards. This is the heart of the sound along with a 12" Celestion GreenBack. I tested it out today and it is Clean or Heavy Metal but not as over-driven as a Marshall. I love it now and am still working on improvements in this Amp and the VOX-4s. It "sings" when you crank it all the way with sustain and musical harmonic feedback. Great Amp. but you need Great tubes. This is the secret of all tube Amps. and a Great Speaker as well. Thanks for asking DS and if you need further info. let me know. Stuart

Stuart

http://www.youtube.com/user/InventorDesigns/about
https://plus.google.com/112885889121395946070/about

Edited by - stuartwbuchanan on 06/02/2013 8:51:24 PM
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stuartwbuchanan
Platinum Member

USA
2190 Posts

Posted - 06/06/2013 :  03:08:14 AM  Show Profile  Visit stuartwbuchanan's Homepage  Reply with Quote
When you "bridge" the Normal and Top Boost inputs of the VOX-15 with a 1/4" "Y connector" you can blend both inputs together, the Top Boost, and the Normal. Both together sound "very Mellow" but still bright a whole different sound! The volume of the Amp. is still the same but adjusting the Volume of each channel varies the tone quite a bit and with everything "Dimed" (at "10" - Amp. Slang like 10 cents) - 15 Watts of VOX sound is amazing, it sings, sustain and musical Harmonic Feedback. No Pedals needed! Pure Tube Distortion both Preamp 12AX7/ECC83 and EL84's. I read about "Bridging" in a Tube Amp. book and today I tried it.

Stuart

http://www.youtube.com/user/InventorDesigns/about
https://plus.google.com/112885889121395946070/about
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