#1
first off to set the scene.

Gibson SG > Trem-o-Verb

the SG has dual EMG 81's, i removed all pots and put two on/off switches on (one on/off for the neck and same for the bridge. its in C#std/drop B. with the highest gain i use both pickups on, heavy as f*** seriously.

so now seeing if i can boost the TOV

i go SG > Zendrive > Trem-o-Verb

on the zendrive, its vol max, tone making it a little dark but not by a large margin and 15%-20% drive.

i plug it in, and turn both pickups on and play sounds good, engage the zendrive, it is like half volume.

why?

__________


if anybody is wondering why i did that, i was in a band similar to acacia strain, my tone is very similar to this https://www.youtube.com/watch?v=5fNXspL1hGs

he is on a 3ch dual rec, i am on a TOV (basically dual rec).
#2
Check your power supply voltage.
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#3
Quote by Cathbard
Check your power supply voltage.

9V with DVOM first thing i checked. its a BBE supacharger so the power is good and voltage verified by me. pedal acted normal with a different guitar.

could two EMG81's send more signal than the pedal can take and put out as far as signal goes?
#4
Doubtful, well unless you've done the 18V mod. Then it might, I guess.
How's it behave with passives?
Gilchrist custom
Yamaha SBG500
Telecasters
Randall RM100 & RM20
Marshall JTM45 clone
Marshall JCM900 4102 (modded)
Marshall 18W clone
Fender 5F1 Champ clone
Atomic Amplifire
Marshall 1960A
Boss GT-100


Cathbard Amplification
My band
#5
Quote by Cathbard
Doubtful, well unless you've done the 18V mod. Then it might, I guess.
How's it behave with passives?


great. its what i use to boost my lead channel on my MKIV, usually a ibby prestige or gibson something or another usually my LP's

the guitar plays fine on the amp, just the pedal cut the volume.

should i do the 18v mod?
#6
It does sound a bit odd. The 18V mod on the EMG's won't help. Running the boost on 18V may though. They're just an op-amp driven tubescreamer type design, yeah?

Just double check it with another guitar to make sure you haven't just developed a fault.
Kyle'd be the man to ask. He's the opamp wizard.
Gilchrist custom
Yamaha SBG500
Telecasters
Randall RM100 & RM20
Marshall JTM45 clone
Marshall JCM900 4102 (modded)
Marshall 18W clone
Fender 5F1 Champ clone
Atomic Amplifire
Marshall 1960A
Boss GT-100


Cathbard Amplification
My band
#7
Quote by Cathbard
It does sound a bit odd. The 18V mod on the EMG's won't help. Running the boost on 18V may though. They're just an op-amp driven tubescreamer type design, yeah?

Just double check it with another guitar to make sure you haven't just developed a fault.
Kyle'd be the man to ask. He's the opamp wizard.


another guitar was fine, amp and everything else. they are a different circuit than a TS i think, but i am not sure.
#8
Haul Kyle and Matt in here.
Gilchrist custom
Yamaha SBG500
Telecasters
Randall RM100 & RM20
Marshall JTM45 clone
Marshall JCM900 4102 (modded)
Marshall 18W clone
Fender 5F1 Champ clone
Atomic Amplifire
Marshall 1960A
Boss GT-100


Cathbard Amplification
My band
#9
I dunno. There's nothing in the Zen or Tremoverb schems I see that would indicate an impedance issue. The EMGs shouldn't have so much output that they'd totally overload the Zen either. I'm confused as to why there would be a volume drop. You don't have a scope, do you? I'd measure the output voltage of the EMGs (should be like 1V at peaks, around 400mV or so average) and then see what the max swing of the Zen is (should be ~8V or so) with two different guitars.

EDIT: What op amp did Tim use for that? 4558, right?
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#10
Quote by mmolteratx
I dunno. There's nothing in the Zen or Tremoverb schems I see that would indicate an impedance issue. The EMGs shouldn't have so much output that they'd totally overload the Zen either. I'm confused as to why there would be a volume drop. You don't have a scope, do you? I'd measure the output voltage of the EMGs (should be like 1V at peaks, around 400mV or so average) and then see what the max swing of the Zen is (should be ~8V or so) with two different guitars.

EDIT: What op amp did Tim use for that? 4558, right?



the guitar is two-ish hours away at my other house. usually i just go 100 MPH though gator alley.


i have no idea nor how to check. the pedal. and i tried it with a 2750 EVSL Ibby with the liquifire and cruch lab.

when i measure V, should i just get the reading from the output jack on + and - ?
#11
He's talking signal voltage so you really need an oscilloscope. I guess you'd get a rough idea from a DMM measuring AC across the plug. You could try, I'd use my CRO.
Gilchrist custom
Yamaha SBG500
Telecasters
Randall RM100 & RM20
Marshall JTM45 clone
Marshall JCM900 4102 (modded)
Marshall 18W clone
Fender 5F1 Champ clone
Atomic Amplifire
Marshall 1960A
Boss GT-100


Cathbard Amplification
My band
Last edited by Cathbard at May 25, 2014,