volume problem in fx loop

[Ranalog]

Hi everybody again,

I 've a little problem with the volume in my fx loop. (look schematic)
I have some effects (delays, chorus...) that run well, but when I conect my nova system I lose lot of signal, I need to put the send and return pot at MAX, to match a little the bypass signal with the fx signal, but is lower.

The Nova system is configurate with 0db output

What can I do?

[tele_player]

I don't have a nova system , but a google search for ' nova system passive loop' got me to this
http://forum.tcelectronic.com/topic/924 ... g-tworock/

Edit: I just realized you're not using a passive loop, but still suspect you've got level set incorrectly on the nova system.

Robert

[Ranalog]

Yes, I now this solution, but I desagree with this option, I want a little more range for up the signal in the fx loop. The tube of the Cathode follower and return stage is a TAD 12aY7.

[Synchu]

I am sure you are aware of it, but 12AY7 gain factor is 45 compared to 100 of 12AX7 so that might be a bit too low for effectively compensating the signal loss.
Niki

[Ranalog]

Yes I know

[10thTx]

PLEASE look at how you have your master volume in parallel with the send pot on the FX loop. It is paralleled from the master volume wiper to ground with the send pot.

When you do that, it reduces the value of the master volume or send pot because it is paralleled.

EX: parallel a 100k with 100k and you have 50k.

So, what you are wanting to do is to NOT parallel those two. The schematic I am showing you will have either the master volume engaged when the FX loop is not engaged. OR, the master volume removed when the FX is engaged.

The way you are doing it with paralleled pots is creating a volume drop with the FX engaged.

Hope this makes sense to you? Just rewire it like I've shown and report back letting us know if that resolves it for you.

With respect, 10thtx

[Ranalog]

Yes. I tested it, its a good solution but i dont want yo lose The master volume , but us a good solution. I prefer dont hace The send pot, but dont know, what can i do yo adjust the signal.

Sorry

[10thTx]

You are not losing a master volume. Without the FX loop, you have the master volume. With the FX loop both the FX send and FX return (or FX level) act as a master volume.

On my amps, I have NO "specific" master volume and always use the FX level as my master volume. It works great! I prefer it over VVR, PPIMV, and the typical Marshall style master volume.

In other words both the "traditional master volume" and the FX level allow the front preamp to be cranked more while lowering the input to the LTPI.

Functionally, you are NOT losing a master volume whether you have the FX engaged or not engaged.

With respect, 10thtx