Saturday, 2 September 2017

Diezel VH4

"Unlike traditional overdrive stomp boxes, the VH4 Pedal is a true preamp which delivers an authentic representation of its namesake – real Diezel tone – not emulated, not modeled, but sincerely reproduced. The entire signal architecture is faithful to the original: Bass, Mid, Treble and variable Deep and Presence controls allow you to tailor the uniquely Diezel Overdrive character. The command found in the Gain control gives a player everything they will ever need with lower gain settings producing the classic Diezel sparkle and chime to saturated mid-gain sounds, to scorching Diezel leads by cranking it all the way up.
As close to the original VH4 preamp, the VH4 pedal can be used as either an overdrive or as a standalone preamp to feed into your amps power section. What players take away by going direct into the power amp is all the dynamic, unfiltered Diezel tone by simply plugging into your amplifiers clean channel. Two outputs are provided with the first intended to connect to the front of a guitar amplifier and the second allows for a connection to a line-level power amp or power section of your amp via the Effects Return."
Original FSB thread and schematic available here.
This is a buffered effect.
Follow the layout's footswitch wiring.


24 comments:

  1. You beautiful bastard. Ima get on this now. Thanks man!!!

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  2. Have to give this one a go. Superb layout as always. Great work Alex!

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  3. I need to build this and compare it to the Diefet I built... :D

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  4. it's huge! 7 pots on a overdrive!

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  5. This comment has been removed by the author.

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    1. Maybe many of you remember this other Diezel VH4 pedal. I built three of these and loved them. Very different approach, though; 5 FETs that need to biased. http://4.bp.blogspot.com/-f4fgFVxv6Ls/U4-WSEDOjsI/AAAAAAAAHqk/DNSa458u7LA/s1600/Diefet+-+Diezel+VH4S+Simulator.png

      Will be interesting to see the difference if anyone does both.

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    2. I built both, this VH4 is much better IMO, sounds tighter with more effective controls

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  6. this may be a silly comment but I assume I can just leave out the pre amp jack as its something I'll never use?

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    1. Do you mean the "power out" jack - I am not sure why that is there (an extra 9v DC tap?)

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  7. I think its an additional output designed to be used before the power section of the amp, I don't use my fx loop so won't need it

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    1. if you read what it says on the diezel's website about this pedal it states:

      Out to guitar amp: Connect to the front end of your amplifier.

      Out to power amp: Connect to rack mount power amplifier or the return jack of your amp’s effects loop.

      i believe the idea is that the power amp output is to use the pedal as a preamp rather than a distortion pedal

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  8. ah cheers Zach, I assume i can just leave it out, although might be useful as a pre amp

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    1. Honestly I haven't had a chance to take a look st the schematic so I can't say yes or no. If it were me and I had the space in the enclosure I would keep it in cause even if you don't use it it's nice to have. Plus knowing me I'd say I don't need it then regret not putting it in and have to go back to put it in.

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    2. yes I think that's the best route, I had a nice delivery of 1590bb's yesterday and plenty of space on my board. there have been a couple of builds I've regretted leaving bits out of

      thanks buddy

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  9. One thing to note, if you plan to power it with a 9V PS, omit the LM and add a link from I to O.
    This is what I did and it sounds great at 9v (didn't try 12v)

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  10. must built list on priority~ thanks the layout.
    btw,are there any replacement for lm2940?
    or can I omit it and feed in 15v reg charge-pump to 7660s pin-8?

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  11. Call it verified! Built it on Saturday and couldn't get it to work. Went through all the usual debugging and just couldn't find anything. Was getting sound through but just a squeal. Anyway, came back to it tonight and first thing i noticed was i had D3 the wrong way round....Doh! Fixed that and now its alive and sounding great. Thanks Alex & the dudes at FSB.

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