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Messages - joecool85

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Amplifier Discussion / Re: Coxx GG-30 with low volume issue
« on: January 14, 2021, 08:36:35 AM »

Sorry for long time without update. I received the LM1875 today, I changed it and the problem was still there   :grr
I decided to remove the surrounding capacitors and measure them one by one. It turns out that C12 was damaged, but not in short so I didn't detect it before. It measured some kohm in resistance and 0,5 uF instead of 4,7 uF. That damned capacitor drove me crazy.
Anyways, I changed it and the amplifier is now loud again.

I would like to thank a lot everyone that helped me, in particular dmeek that made a lot of work with reverse engineering.  :tu: Without the shematics I would have been lost. I hope that these posts will help people with the same amplifer.

Good job!

The Newcomer's Forum / Re: Soldering Iron Tips
« on: January 14, 2021, 08:15:14 AM »
The Weller tips I use cost more than your iron did!  Not sure what to recommend that would be inline with your budget.

Guitar News / Fender releases new headphone amp - Mustang Micro
« on: January 14, 2021, 08:09:12 AM »
Available for purchase April 2021, or pre-order from many places now, the Fender Mustang Micro will sell for $99 USD.  It comes with 12 amp models and 13 effects.  It has a headphone out jack as well as USB which is used for charging and direct recording to a computer.  DSP in your pocket, guitar case, or desk drawer!

Could you add Ireland for shipping please. I'd vote for no speaker.

Sent from my SM-G935F using Tapatalk

All set!  Also, I spent some time with the USPS rate tables online and was able to figure out "world" prices and now this kit is available anywhere via First Class USPS International shipping!

I'm thinking about adding an option for purchasing the kit with a small speaker.  Thoughts?  Personally I wouldn't be interested, but I have had one person mention to me that it would make the kit more complete and might be more interesting for some people.

If so, should I go cheap (sub $10 per speaker) or a legit Jensen etc for maybe $25-30.  The Jensen would double the price of the kit is my concern.

Guitar News / Gibson acquires Mesa/Boogie
« on: January 10, 2021, 06:19:22 PM »
One of the most expensive major guitar brands, Gibson, has now purchased one of the most expensive major amplifier manufacturers, Mesa/Boogie.  Now I'm not saying anything bad about either company, they both make killer stuff!  But they are pricey.  It will be interesting to see what happens moving forward.  Mesa/Boogie will be making Gibson's new "custom series" amps.  Maybe they (both companies) will start a line of gear in the several hundred dollar range rather than several thousand.  We'll see!

Hey Joe, pretty cool amp.  :tu:

I'd back the project but I'm in Canada.
Can you change the kickstarter to allow folks from Canukistan to back it?


I've made the adjustment! Only reason why is that you have to calculate shipping for each country. If anyone else from another country is interested, let me know and I'll add it as an option!

I would love to hear some sound samples from the amp, demonstrating the tone control and variable distortion.  It might help your kickstarter, too.

It is on the Kickstarter page, but here is the video on its own:

It's official, the Kickstarter campaign is live!

The Honey amp is a small 1/2w, LM386-based amp.  Unlike most LM386 amps though, it doesn't use that chip for it's primary distortion.  The LM386 is set open for a gain of 20.  Preamp duties are taken care of by a modified version of my 5th Gear Overdrive circuit, including a custom BMP style tone adjustment.  I've voiced it very similarly to the Top Boost circuit of a Vox AC30 - it does not emulate the Vox, but it does have similar tonal response.

It can run from 6v to 18v (spec'd with an LM386-4).  It comes with aux in and headphone out 1/8" jacks, and has gain, tone, and master volume controls.  Check it out!

Amplifier Discussion / Re: Krell amplifier repair
« on: November 19, 2020, 11:50:55 AM »
Great job!

Amplifier Discussion / Re: Amp help for a(n old) newbie
« on: November 05, 2020, 08:56:15 PM »
Being a Fender tube amp, resale is pretty great.  You could definitely get a few hundred dollars for it and turn around to buy a new amp.  That said, this amp should last...forever-ish?  Maybe some tubes here and there, but not bad.  If you like the sound, I'd recommend keeping what you have!  :dbtu:

Schematics and Layouts / Re: Pignose amp?
« on: November 03, 2020, 11:41:45 AM »
Without a schematic I'm not entirely sure what they have going on there.  But one thing I can tell you, a little bit of contact cleaner (I use Deoxit) will most likely fix your issue.  Put the contact cleaner onto a 1/4" plug, work it in and out a few times and try again.

Thanks joecool,

(I got stuck in progress…)

My concern about the speaker-swap came from an exchange here (although some years ago) that the Vox Mini3 is (was?) peculiar about it and would fry the preamp if particular care wasn’t given (like, the ground was not really a ground, etc.) Is this still a problem with the new issue of Mini3-G2?

Other concern – widely shared and confusing – WHY, oh Why can’t be Lithium batteries used? The dire warning on the Mini states “use only alkaline AA batteries”. Will it go "pooof" if I use a Lithium battery, output almost exactly matching that of the Mini’s switching power’s? My Lithium cell is 12v-3A (nominal) center positive, the Mini is 12v-1A (nominal?).
Is the pack of 6 x 1.5v AA (9 volts) better? I produce seemingly unending heaps of dead AAs week after week…
In general, perhaps a modern, universal battery powering system should be developed and employed (and it appears that the Lithiums is the way) instead of the clumsy, inefficient and expensive 4-6-8 x AA alkalines?
Paul Gabor

It depends on the voltage of your lithium ion cell.  Normally they are 3.7v/cell, bringing it to 11.1v or 14.8v to be on either side of "12v."  If it is 11.1v, then that's fine.  If it is 14.8v, it may or may not be fine.  I would say check the voltage of your power adapter - if it is higher than or the same as your charged li-ion pack, go ahead and hook it up to your 12v input.

Either way, without looking at the inside to trace circuit, I would not recommend connecting anything higher voltage than 9v to the battery hookups as this is what it was designed for.  Higher voltage will need to go through the 12v input.

11.1 or 14.8

The Newcomer's Forum / Re: Soldering Station
« on: October 20, 2020, 10:02:49 AM »
I use the Weller WLC100.  It's a 40watt setup, not temperature controlled per-se, but you do have the dial which controls the wattage (and hence temperature) really well.  They go for $40-$60 USD depending on where you find it.

Guitar News / Vox Valvenergy - NuTube pedals are finally out
« on: October 15, 2020, 11:51:54 AM »
For just under $200 USD, you can get a Vox Valvenergy pedal onto your pedalboard.  The concept is that using a "NuTube," which is effectively a small flourescent tube, will bring you "real tube" sound.  Is it worth it?  Does it work?  Not sure, but if I see one in a local guitar shop I'd sure try it out.  They look cool, and the concept is great.  It sure is expensive though...

Of note, this technology has been in a handful of their amplifiers for months now and they do have fairly good reviews.

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