Dumpster Diving Guitar Amplifier
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- Опубликовано: 28 май 2024
- Dumpster Diving Guitar Amplifier. A 10W Jordin PGA-10
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Those are cheap, common design basic beginner/starter amps, just fine for quiet home practice. Definitely not gigable. Nearly all manufactures use the same basic layout. The PC board is likely built to accommodate a more intricate circuit on the less cheap models
I build amps like these all the time, usually an LM 386, 4886, JRC386 single or dual variety, lots of filtering, couple MOSFETS, an MSA13, J201, or MPF102 transistors. But I install them into unusual cabinets like a small jewelry box, lunchbox, small radios. The smallest one I made was just 5 components in an Altoids tin. It sounds awesome!
That dumpster room never stops giving. One day Dave will find the meaning of life there.
Well he could have plugged in a guitar and worked on 'Stairway to Heaven'
Well, to be honest, that's what like 90% of guitar amps are, not really anything electrically special. Some older ones might have some opto-electronics for vibrato circuits that are near impossible to get today and there's some with some fancy features that are special in guitar amps but probably quite normal and boring generally (like tube bias indicator circuits in Hughes & Kettner amps). Even the big brands are pretty much "meh", some good building but that's it. Guitar amps might be one of the few things where taking a look at garbage is actually more interesting than taking a look at the high-end because at the high-end it's just an amp with good build quality and maybe some black-goo to seal the magic or sometimes just plain money grabbing. At the low-end you actually have the excitement of finding the probable house burners and "how to not do things" pieces, also the extreme cost cuttings are sometimes fun.
But generally they are amps but instead of trying to make magic electronically, they just make marketing with some guy with a long hair and fast fingers and hire some other guy to write some mumbo-jumbo that makes zero sense but sounds cool enough, and the guitar amp afficionados go crazy and start fighting how one vacuum tube made to a spec is so much different from another one made to the same spec.
Guitar amplifier usually don't have insulation in them because they want the chamber zo resonate
Awwaa ! don't be so bloody mean on the little guy, some kid out there would love to own it and love for years to come....cheers.
I have one of these amplifiers very similar
I converted it into a battery operated, rechargeable, busking amplifier It's a 12 V circuit board so 12 V lithium or lead battery will do fine . Any Guitar player ( or Musician for that matter) who busks would love that.
It runs over 3 hours,
depending on size of battery
BTW I found mine in the skip also
Crank it up Dave!
Let me just grab my axe.
The unpopulated part of the PCB looks to be a reverb circuit. You can see where there are two header pin spots labeled REVO and REVI for reverb out and reverb in to a reverb unit (wobbly spring and transducer).
I have this exact little amp. lol.. I'm not sure about the name, I'd have to check; But It's the same layout and same size.. I had picked it up back in early 2000's from "hastings".. Which was a movie rental store and they also had a lot of books.. and that's where we would buy all of our CD's too.. (it's closed down now, in my city). For some reason they had an amp With guitar all in one package for one hundred dollars.. and I bought it. And it's the electric guitar that I learned to play on and still have it today... You should have checked it-- I bet it still works fine. The main thing that goes bad is in input jack.... Otherwise, it's a surprisingly useful little amp.
I feel crestfallen that Dave ended up not being thoroughly enthusiastic about this. Maybe because I also have a "cheap" guitar amp too.
"Still got the ol' tagger on it, never even played it!"
It's a cheap practice amp and you can score that kind of stuff at music school, they toss them when they starts to get crusty and crackly. I have a small pile of them.
Good for parts to fix better ones, like cabinet angle protectors, pots, pots knobs, the transformer is usually okayish too.
Even big name in amp like Marshall sell this kind of practice amps and they actually are exactly the same thing as this one. All sounds decent, it's not crap, it's just low power , no features products. The unpopulated section on the board show that the same thing is used for a better model.
Yep those look like genuine Rubycon caps!
Usually fake ones do not have the K vent indentation on top...
Also if it is really over 10 years old, fake ones would have splurged all their gunk over the board!
I was implying they might have been used parts
I'm a big fan of this series
Still a fun quick tear down! Keep em coming!
It does look a bit crusty. Inquiring minds still want do know if it works. If it works and the the input jack was replaced someone starting out with electric guitars may still find it useful.
We're Gettin the Band Back Together
Its not as bad as i expected. Definitely seen worse. Its using a discrete power transistor output stage, not just some TDAxxxx amp chip.
Looks a lot like how the Fender Frontman 15G/R is constructed. Not exactly the same but certainly they took 'inspiration' from it.
The Frontman has a TDA2050 as a 'power' amp IC.
Missing components had a "rev" label in it. Reverb?
yes, it's reverb.
It's reverse,
it's for the upgraded model that puts music back into your guitar so you can pretend to play.
@@volvo09 Paul is dead.
Best guess it probably came in a cheapie no name beginner guitar/ amp combo packs.
I have one of those for practice, but it’s badged as an Acoustic Solutions EG-10J. Otherwise identically cheap. Mine has an overdrive switch.
Eol it like photonic induction
The missing stuff might be for the guitar distortion effect, i had a similar amp with different branding back when i was a kid here In Beirut and it had a button for distortion.
Jordins sounds like a kids clothing brand....
Davo, they were selling this one at the back of the boot of the unmarked vehicle... and when you look inside the amp its just air
Dave, as a side hustle, have you thought of conducting tours of your "Dumpster room".
Charge $50 for tickets; call them "Lucky dip tours" !
Even tube based guitar amplifiers use the cheap way of mounting tube upside down that was used back in the day to cut coast. It's a better practice to put the tube the right way and to insulate from the speaker among other better design practices
Those little amps are great, they are made on some many names though. I suspect the missing components are the overdrive circuit.
Nah, that must be a reverberator or some other sound-dood-iser. An overdrive capability is an essential feature every guitar amplifier MUST have for you to be able to play classic heavy metal music. And it must be accessible by turning a correspinding knob up. Noone would even consider buying a guitar amp if it could not go into overdrive as that is pretty much what electric guitats are for.
Rubycon caps!!! 😮
That can go back to the dumpster room
The knobs don't go to 11??
The missing stuff looks to be parts for a reverb circuit.
At least it's got a transformer you can salvage for the parts bin....
Surprised you didn't plug it in....
I scored a dead 'Peavey' branded version of that from a music shop, was going to turn it into a general purpose (as opposed to guitar) amp for general music listening in my bedroom, having a guitar amp in there seemed a cool idea at the time. However all I can keep was the box, as even the driver will have to go as it's a weird muso special which will probably sound terrible with HiFi audio fed into it.
What a rave! 🤘🤘
This is what's known as a 'practice amp'.
It looks the same as some cheap practice amps with brands like Marshall written on them. Really not bad.
I’d keep the transformer and take some components off the board and toss it back out. Maybe keep the speaker too
Marshall, Fender, Blackstar, Orange, BOSS, erm... I'm not so up on them either, even though I probably should be! Although, I mix/master rather than record. I just "fix it in the mix".
So the big let down these little amps is the crappy speaker, however if you fit a speaker out socket then you can use these things as an amp head and run them into a bigger guitar cab for a much better tone.
If this one still works then why not donate it to some kid to use rather than send it to the land fill.
Does anyone have an idea of the levels I can expect on the input from an electric guitar pickup? Similar to a moving coil record pickup maybe? Just building a guitar amp for my daughter!
Magnetic phono level, without the eq curve though,
@@jim9930 Thanks - that is a great source of information and circuits!
I could see Dave in a Prog-Alt-Rock band.
What would be my instrument?
@@EEVblog2 The 7-string soldering iron.
I found a reference to Alt-Prog. Can you name a few big-time Prog-Alts or Alt-Progs for me?
@@EEVblog2 I'm sure you could get some gnarly sounds from that sig gen
@@EEVblog2 I would think if you played an instrument, it would be a modular synth. Lots of wires to hook up and lots of knobs to twiddle. With the input waveform driven by one or more sig gens from your collection of test gear of course.
Appear to be copying the Fender Frontman 10G amp (I have a couple). Worth stealing the transformer maybe.
The Fender Frontman 10G is only AU$129. Wow, didn't know the big brands were that cheap.
@@EEVblog2All the big brands have their cheap chinese practice amps for beginners. If you want a real US made fender tube amp you're $2k+
@@looking_33 When I played I also had a Fender Supersonic 22 (solid state) and even those are £1500.
@@looking_33 2K ? That is absurd.
@@vincei4252 That is just the beginning. One of the most common and standard Fender amps the Twin Reverb retails for $2,099. It's a different world in terms of price for the dedicated musician. Completely disconnected from the consumer price scale. Meanwhile Marshall, you know the amp you see next to Jimmy Page and every famous rockstar in history, they want $3,849 for that one. Let's not begin then with the prices of boutique amps...
To be fair, guittar amps are naturally janky if you compare them to propper listening speakers. Even the nice ones.
Most beginner and even some not so beginner amps are like that.... completely hollow inside, basic electronics, not much to write home about. I honestly think you won't get that much of an upgrade for amps that size even for the more fancy brands. I had a Fender back in the 90s not much bigger than that one that was just like that inside. Sounded like squeaky sh*t tbh... but hey, I also sounded like squeaky sh*t, so fair is fair. xD
Yeah white van speaker scam decent size speaker tho
"it's clearlly old" yeah, most of these guitar amps have this "vintage" design to them, this amp could have been fabricated eighter 30 years ago or last year
My nightmare is David tearing down one of my product 10 years from now and completely destroying every choice i've made.
The difference in copper wire in a cheap product from 20 years ago and now is night and day.
what's the difference ?
Yea nah...yea
I think Dave buys cheap crap from thrift stores or Gumtree to make content :)
You're busted Dave.. lol
@@calholli Yeah, totally busted.
Keep the knobs at least.
can i have it please i wont it
It doesn't have gold plated connectors so it's garbage 🤣
You can just buy one and install it
"It's a hyaena..."
Totally meh indeed, cheap and run-of-the-mill practice amp. Way too crappy for a Keritech Electronics Totally-Tubular-Transition. The piece of sheet metal semblance of a chassis ain't even gonna hold an ECL86 with a pair of transformers. Send it over to Brad's Guitar Garage if you want, I'd like to watch him roast it.
Truth be told... even big brand amps of this class ain't nothing special. It's all just there to cater to beginner guitarists with cheap axes - but egos big enough to care about logos.
A genuine Fender doesn't cost much more than this thing.
@@EEVblog2 it's all made in China after all. The rest is marketing.
@@EEVblog2 Yes, and the internal design doesn't look much different. However, it's not just the cheap ones. Recently, there's been a lot of discussion about the build quality of expensive amps as well. Take the new Gibson Falcon 20, for example: ruclips.net/video/LGAkcGctgN0/видео.html. They're asking for $5k for it!