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Messages - joecool85

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Tubes and Hybrids / Re: What to do with this old Pye radio?
« on: September 16, 2020, 09:04:17 PM »
It's been a while but this is going to be a powered speaker and maybe guitar amp. It has some of the lovely old radio sound due to the speaker and the enclosure even if theres no valves in the signal path. On the right is a whopper of a volume/tone/power switch. Pot seems noisy but I will definitely use the on/off element. The front panel lights up with good old fashioned incandescent bulbs. I plan to leave the chassis intact and in situ.  Should I discharge the old capacitors for safety?

Sent from my SM-A505FN using Tapatalk

If the old caps haven't been powered up in years, you're fine.  If more recently, stick a multimeter across and see how many volts are sitting there.

Also, how do you like that Kemo brick amp?  They look neat, but I haven't tried them myself yet.

Hi Everyone,

I'm new in these hallowed halls and learning the rites, so have mercy...

In the age of "The Club Goes to the Street" I decided to build (assemble) the World's Greatest Street Sound System - under $ 100, weight 11 lbs., battery-run, pretty and disguisable.  I might need some advice... I'm a musician; I guess breadboards are for toast, no?

To a test I'd like to start with replacing the speaker in my recent issue Vox MINI2, 3Watt street amp. Also, take the whole thing out of it's cute, "boutique" enclosure. Then progress will follow to yield the above superlative.

I've learned (here) not to mess lightheartedly with that speaker-swap in this amp, so it still works. But the sound it does is not what I want. If possible I'd like to test it with 2 x 4" (5)", 90-SPL Visaton speakers - or better. Can this be done, and if yes, why not? (I understand Ohms, but there's more involved here).

Any advice pertaining to this and, consequently, to the Miracle Mini Monster System that will quickly follow is greatly appreciated.



There really isn't more to it than ohms as far as what is safe to connect to the amp.  I'm not sure what it has stock, but assuming 8 ohm (please check this), then you could use two 4 ohm speakers in series, or two 16 ohm in parallel.  If you are trying for more volume, I recommend at least 93 db/watt SPL, but ideally 96 or greater.  Is there a reason for only going with 4 or 5" speakers?  This keeps you pretty limited.  Once you get to 8", things start to open up substantially for great SPL as well as sound quality across the frequency spectrum.

Good luck and welcome!

Amplifier Discussion / Re: fender ultra chorus distortion
« on: August 25, 2020, 11:42:25 AM »
it's all moot now!

i had a FEELING i was barking up the wrong tree - joecool's early hunch was right!

after a ton of pointless tinkering, turns out C47 had come just evverrrr so slightly desoldered. argh! anyway, secured it and we are good to go - i knew it would have been something like that - whenever i find myself too deep down the 'doesnt make sense' rabbit hole, it turns out to be some mechanical nonsense -

thanks, guys!!

Glad you were able to get it going!

Amplifier Discussion / Re: fender ultra chorus distortion
« on: August 18, 2020, 09:23:10 PM »
The +/- 18 sounds a bit high for 16V zeners.  Check for ripple on those supply rails.
Also, the schematic does not seem to show where the 3007 & 3101 get their supply from.  Check for ripple on those supply pins too.

Is it possible that this is normal for this model?  It sounds like there is no problem unless the chorus chips get too large of a signal?  You might want to check around and see if other people have complained about this issue for the same model.

If all checks out but this is just poor design, he could always do a voltage divider running into the chorus circuit so that it didn't get quite so hot a signal.

Amplifier Discussion / Re: fender ultra chorus distortion
« on: August 14, 2020, 10:00:41 AM »
its Clear the distortion is coming from the chorus effect -

If I mess with the chorus bias, I can hear it getting better or worse, but I can’t get it to go away. It kind of sounds like the chorus effects internal gain or makeup gain is too hot - but what causes this and how to repair?

I would verify connections on the opamp going into the chorus.  My guess, either a shorted resistor or a cold solder has let go.  One way or the other, the voltage divider has been broken and it's sending too much signal and getting distorted.  Or the opamp isn't get proper voltage, also causing distortion.

any info on what's inside it? class a/b or class d?

here is a patent listed on it lol

mesa costa. ca hmm patents...mesa...must be friends with Randall Smith

Not sure what's inside, but it sounds good!  That said, it sure is expensive.

Amplifier Discussion / Re: Woodstock GX-55R SS Amp
« on: August 13, 2020, 01:33:51 PM »
Sounds like someone already uploaded a file with the same name as you want to use.  Try renaming your file first., or resave your file under a new name and upload that.

That's exactly it, just need to rename your file before uploading.   :dbtu:

Quilter has announced their new OverDrive 202, actually it was back in June but I somehow missed this one.  Anyway, it's a 200watt, 2 channel, pedalboard-sized monster.  I'd love to have one, that's for sure!  MSRP at $575 means I won't be seeing it any time soon though.

Amplifier Discussion / Re: peavey musician series 400
« on: August 07, 2020, 08:58:16 PM »
Sounds like shot power supply capacitors to me and/or rectifying diodes.  Regardless, before trying to turn it back on, open it up and look for any burn marks etc.  If all looks good, then build a quick light bulb limiter, plug it into that and start taking voltage measurements with a digital multimeter (we can help here).

Light bulb limiter:

Amplifier Discussion / Re: Crate G130C Amp
« on: August 07, 2020, 08:54:55 PM »

* At some point I started having an issue with the Amp where the output sound would fade out.*
Have you checked your FX loop? a common cause of intermittent signal drop out.

Phil is on it.  Try running a patch cable between the FX send and return jacks.  If this fixes it, your jacks just need to be cleaned (or replaced if it really bad shape).

Amplifier Discussion / Re: Official SSGuitar kit, on-board options
« on: July 27, 2020, 03:20:00 PM »
Any update on the progress. I see in the news that the pcbs have arrived   :dbtu:

Things got tied up with me being crazy busy at home and work.  It's still progressing, just slowly.  I'm about to get another small run done for a second prototype with a few changes in the tone stack and some new artwork on the board.   :dbtu:

The Newcomer's Forum / Re: early 90s Peavey Stereo Chorus 212
« on: July 22, 2020, 02:46:44 PM »
Refresh the connections to the DFX card.

A few years back I fixed a Fender DSP amp by just a simple unplug/replug of the DFX PCB.   :dbtu:

Hamstead Soundworks has released a new single knob, clean boost pedal.  The Ascent Amplitude doesn't seem to be technically anything terribly new or interesting.  But socially, it sure is.  They are employing tech members that normally work with Iggy Pop, AC/DC, and The National, to put these together - helping people that were unemployed due to the COVID-19 pandemic.  On top of this, part of the remaining profits also go to a charity to help struggling musicians.  I think this is a great idea.  If their booster plays half as well as their social concept, it's money very well spent.

Guitar News / Re: Coronavirus hitting the music industry
« on: July 12, 2020, 08:57:04 AM »
In person concerts are starting to come back...sort of:

Electro-Harmonix (EHX) has released the new Cntl Knob (pronounced "control knob").  This pedal can be used on all devices that have a TRS "EXP" or "expression" pedal input.  It simply has two knobs and a footswitch between them.  Set EXP1 to your first sound setting, and EXP2 to your second.  Then toggle through them at will.  It's a simple device, but for $39, I could see this being very useful for a lot of people!  Plus it looks pretty darn slick!

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