FX loops coming to Metro.

[Jsinca]

[
So you could also just power scale the power tubes and PI, and leave the loop and preamp unscaled. I suppose that's an option. Just typing out loud.

Yes I could.
But it requires a master volume. When scaling just the power section, the preamp produces too large a signal for the power section to handle.
Due to space limitations I prefer not to install a master volume.
I'm going to try feeding the loop a non scaled B+. I'll let you know how I make out.

Thanks for the suggestions

[Jsinca]

Update.

I moved the loop B+ to the unscaled output. Works like a charm. I can now scale the amp and still have a functioning loop.

I'm loving this loop. Highly recommend it. It truly is transparent, just as advertised

[SDM]

Sorry to be absent for a bit here, but very glad to hear the loop worked out well in your scaled amp setup Jsinca.

I'm sure others wanting to use ZL loop in power scaled amps will find your results quite helpful, your "guinea pigging" appreciated.

[Jsinca]

Glad to be of service.

Thank you for all your help and for building this great loop.

[syscokid]

Sorry to be absent for a bit here, but very glad to hear the loop worked out well in your scaled amp setup Jsinca.

I'm sure others wanting to use ZL loop in power scaled amps will find your results quite helpful, your "guinea pigging" appreciated.

+1...

...

[UsrName]

I finally got around to installing the loop in my 4010 combo. Not as bad as I thought it would be, except the switch wouldn't fit with the board in, so I just relocated it to in between the jacks and it works great there.

I realized after the install that the switch orientation is "upside down" because I have the combo. However, I have a question. With the switch in the down position (on), the loop works fine, but when I put it in the up position (off), the amp gets a lot louder. Is this normal? Just checking.

I've only tested it at really low volumes so that might have something to do with it, I'm guessing. Here are my test readings after the install (I left the single 10k resistor as is):

Loop board reading = 271v
B+ reading = 390v

[Deric]

Have you adjusted the trim pot on the loop board?

[UsrName]

No, I haven't tried that yet but I'll give it a shot tonight. The volume difference is about twice as loud with the loop out but hopefully this will help. I was just wondering if I had hooked up something wrong.

[nimeine]

Has anyone ever successfully installed zero-loss FX loop in a Soldano Avenger 100w head?

Did it fit nicely in the chassis? Did it worked fine with pedals?
Where exactly did you put it on the signal path?

I`d like to do this mod, but it would be nice to hear some comments before I order the kit.
You can tell about Zero-loss in other Soldanos too.

Pictures or schematics would be great!

[UsrName]

Have you adjusted the trim pot on the loop board?

Adjusted the level and all is good now. Thanks to everyone who answered my questions, much appreciated. This loop rocks!

[SDM]

Have you adjusted the trim pot on the loop board?

Adjusted the level and all is good now. Thanks to everyone who answered my questions, much appreciated. This loop rocks!

Glad that was it, but the loop trimmer should be pretty well adjusted for unity by Metro during testing normally. Did you by chance adjust/change the trimmer setting before install, or did it just come pre set that way?

[UsrName]

Have you adjusted the trim pot on the loop board?

Adjusted the level and all is good now. Thanks to everyone who answered my questions, much appreciated. This loop rocks!

Glad that was it, but the loop trimmer should be pretty well adjusted for unity by Metro during testing normally. Did you by chance adjust/change the trimmer setting before install, or did it just come pre set that way?

No, didn't touch it before or during the install. I thought it would be right where it should be from the factory, which is why I thought I'd better ask. Could it be because I didn't change the 10k to the 8.2?

[USAPatriot]

Hi,

I read through this thread and it seems like the last time this specific question was addressed was back in 2006, and the question was still undecided at that time. So, the question is, is the ZL Loop suitable for the Jet City JCA20H? Will it fit and work correctly? I use a BOSS GT-10 pedal board and will be using those effects...will I also be able to use the GT-10's preamps if I choose? If I do, will the JCA20H's preamp be bypassed? Any instructions available for this application? Thanks! -Rod-

[SDM]

Various people have used the ZL loop in the JCA20H successfully, the Friedman modded JCA20H's (with loop of course) have used the ZL loop for years. A rough guide to install can be found in the thread here:
http://forum.metroamp.com/viewtopic.php?f=7&t=32582" onclick="window.open(this.href);return false;

If only the ZL loop return jack is used, the amps internal preamp signal is defeated. Thus you can use the loop return jack as a "poweramp in", if desired, to use with external preamps/processors/effects or such, automatically bypassing the JCA's own preamp completely.

[USAPatriot]

Various people have used the ZL loop in the JCA20H successfully, the Friedman modded JCA20H's (with loop of course) have used the ZL loop for years. A rough guide to install can be found in the thread here:
http://forum.metroamp.com/viewtopic.php?f=7&t=32582" onclick="window.open(this.href);return false;

If only the ZL loop return jack is used, the amps internal preamp signal is defeated. Thus you can use the loop return jack as a "poweramp in", if desired, to use with external preamps/processors/effects or such, automatically bypassing the JCA's own preamp completely.

I do that on my Blackstar HT-40 and GT-10, but admittedly only because someone asked me to test it. My own loop...with the patch I'm using as my #1...is virtually transparent. The GT-10's preamp (the patch) seems to be just a bit duller than the same effects coming back from the amp's preamp when the loop is turned on. I attribute that to some sort of loss occurring in the cables themselves that I can't dial out. But running one cable defeats the purpose of having a loop. I have plenty of GT-10 patches that do not use the GT-10's preamps...just the modulations...in which case I've actually needed the HT-40's preamp.

The same will hold true for the JCA-20. For the moment I plan on just running modulations from the GT-10 into the JCA20, which is arriving here tomorrow, but I'm not going to be satisfied with that for too long, I'm sure. True, it would have been easier to just go with the JCA22 and avoided this conversation...but it is what it is. Your kit is billed as lossless. Is it? How's it going to hold up when I turn my S/R on and need it to use the JCA20's preamp and the GT-10's modulation effects? Will the preamp hold still or will it drop out? Bear in mind that I can adjust the GT-10's Send and Return levels in a fairly wide range, but it's be nice if you kit gave me real transparency. Thanks! -Rod-