Joyo 5 Watt 'Sweet Baby' 5F1

  • Thread starter Ess Eff
  • Start date
  • This site may earn a commission from merchant affiliate links like Ebay, Amazon, and others.

Ess Eff

Tele-Afflicted
Joined
Nov 6, 2018
Posts
1,615
Location
Earth
If you are not familiar with this, it is a Chinese copy of the 5 watt Fender ‘57 Champ, with the same 3 tube circuit and 8” speaker but an unusually modern looking little cab. Maybe a sloping front and tweed cover would make it a target for litigation? Oh, and most importantly, a ridiculously cheap price, especially here in Oz.

Well, it looks better in the flesh than the promotional pics. I wasn’t too keen on the faux carbon Tolex but it’s not so bad. From a short distance it just looks black, so that’s cool. The sound was great, and surprisingly warm n full for such a dinky little amp, but the circuit IS the real deal and I had read lots of great reviews, so maybe it shouldn’t be surprising.

The fit and finish was pretty shocking but nothing that a little tweaking couldn’t fix. For such a ridiculously low price, I'm not surprised or bothered at all. I had plans for it anyway so I did the tweaking as I pulled it apart.

First up, I would recommend tightening all the bolts. The chassis was flopping about inside the cab because the mounting bolts were completely undone and some of the speaker bolts were also loose. Secondly, all the edges of the Tolex were lifting up inside the cab, so I just ran a warm iron over them to re-stick them down. Rather humorously, the front Badge was attached with sewing pins! Not screwed, not nailed but pins pushed through holes and bent over.

On the other hand the electronics actually look very well done. Metal switch n jacks, solid cable connectors n all the cable pairs twisted together, etc. Almost seems like the electronics factory is at a much higher level than the cab factory.

As I had a spare 10” Jensen speaker and some retro looking grill cloth (courtesy of my Princeton Reverb Mod), I had decided to make a new 10” baffle, just for the fun of it. I thought, if I liked the results maybe I’d make a whole new cab in the style of a Fender Champ, so the first thing I did was to measure up the cab, and verified that a 10” would be an easy fit. Although, I gotta say that the little Celestion 8” speaker looks the part, sounds good and is soooooo cute. I can always just drop the original baffle n speaker back in if I want. Although it is a hell of a tight fit. I suspect they got the baffle dimensions a little wrong.

I knocked up the new baffle in a couple of hours, and in no time had turned my ‘Sweet Baby’ into a neat n tidy, ‘Juicy Juvenile’ with a bit of retro thrown in.

IMG_20190430_193326.jpg

IMG_20190430_193050.jpg

New 10"
IMG_20190430_173554.jpg


Original 8"
IMG_20190430_151759.jpg

Original look
joyo-jta-05-sweet-baby-5-watt-vintage-guitar-tube-amplifier-joyo-459-600x600.jpg
 

AJBaker

Friend of Leo's
Joined
Oct 3, 2010
Posts
4,663
Age
38
Location
Switzerland
Congrats!
I suggest one mod: adding a cathode bleed cap to valve 1. There's an empty spot on the circuit board you can use for the capacitor, it's almost as if they forgot to add it.
 

Teleterr

Friend of Leo's
Joined
Feb 7, 2011
Posts
4,683
Location
Lewes De.
To me the rectifier seems to make a noticeble difference. I have a '60s Japanesse Champ clone w a SS rectifier which seems to give sort of a transistor distortion vibe when pushed hard by a booster. For that matter I notice that in my Tube "Killer Ant" amp too every so often. So the Tube retifier is a definite +. I m not sure if the price difference vs its SS competitors is worth it tho.
 

Ess Eff

Tele-Afflicted
Joined
Nov 6, 2018
Posts
1,615
Location
Earth
I have this amp, nice to know a 10” speaker will fit. Now I need to figure out which one.

Yes, the Jensen C12R I put in is surprisingly, even warmer than the 8" Celestion.
The amp seems to be set quite warm and with no tone control, I think getting the speaker right will be the key.

I'm not really happy with the Jensen, so I'll keep an eye out for something brighter. Problem is, that it is such a cheap amp I'm not sure it's worth spending too much on it.
Maybe just put the 8" back in.

I'll prob do the C7 addition.
.
 

sleazy pot pie

Tele-Afflicted
Joined
May 31, 2014
Posts
1,764
Location
austin
The c7 provided a noticeable difference for me. I have no experience soldering anything but pickups, and struggle with that. So it was a little tight working in there for me, but was a simple procedure.

I put a Webber 8” in there instead of the Celestion it came with.

It is a nice little amp.
 

Ess Eff

Tele-Afflicted
Joined
Nov 6, 2018
Posts
1,615
Location
Earth
The c7 provided a noticeable difference for me. I have no experience soldering anything but pickups, and struggle with that. So it was a little tight working in there for me, but was a simple procedure.

I put a Webber 8” in there instead of the Celestion it came with.

It is a nice little amp.

Well, I wasn't that happy with the Jensen, so I put the original 8" Celestion back in. Damn it is a great little speaker. Who wudda thunk such a dinky little thing could sound so good. I don't have any other 10s to try so the 8 will stay for now.

Did the C7 cap addition and that makes a nice difference too. If you use the right technique it is pretty easy, even with the chassis still in the cab.

It's the white vertical cap in the middle of the pic, for others that might be considering this mod (22uf).
IMG_20190501_134300.jpg
 
Last edited:

Ess Eff

Tele-Afflicted
Joined
Nov 6, 2018
Posts
1,615
Location
Earth
Looks like this stock 1964 Champ except for the extra corners and sturdier looking handle of the Joyo, which looks like the one used on bigger Fenders.
(image removed)

But I somehow think they didn't have faux carbon fibre Tolex in 1964.
What I was implying, was that you would expect a 5F1 c'lone to be in a tweed box and that using a faux carbon fibre was a very odd choice. The black transitional one you show is pretty rare.

Oh, and I wouldn't try using the Joyo handle on anything heavy - there is NO steel reinforcing in the strap like the real Fender handles.
.
JY-JTA-05.jpg
 
Last edited:

radiocaster

Doctor of Teleocity
Joined
Aug 18, 2015
Posts
12,013
Location
europe
But I somehow think they didn't have faux carbon fibre Tolex in 1964.
What I was implying, was that you would expect a 5F1 c'lone to be in a tweed box and that using a faux carbon fibre was a very odd choice. The black transitional one you show is pretty rare.

Oh, and I wouldn't try using the Joyo handle on anything heavy - there is NO steel reinforcing in the strap like the real Fender handles.
.
View attachment 605200
They had those in 1963 too, but I still don't think your Joyo looks futuristic even if I see the tolex better in the last pic. Looks kind of like the Ampeg tolex, not really but not more futuristic as far as I can tell.
 

Teleterr

Friend of Leo's
Joined
Feb 7, 2011
Posts
4,683
Location
Lewes De.
If theres no annoying tone control, this is more like a Gibson GA-5. I much prefer them to champs since I always set my tone as close to flat as the circuit allows and you don t lose volume from Tube 1 in the tone circuit.

Do you find it hotter than a Champ ?
 

NMore

Tele-Meister
Joined
Dec 8, 2017
Posts
345
Location
Castle Rock
My problem with this amp is that it is too clean. I did the C7 upgrade and it made the amp louder,but did not add any breakup. With single coils you have to turn this thing up to 10-12 to get it to breakup at all. With my Les Paul it will breakup sooner but it's not a very pleasing warm overdriven sound. I did change out the 5y3 tube with A GE NOS hoping for better breakup. I think the 8" celestion is not a very proficient speaker, and could be a good place to start experimenting.
 

Teleterr

Friend of Leo's
Joined
Feb 7, 2011
Posts
4,683
Location
Lewes De.
My problem with this amp is that it is too clean. I did the C7 upgrade and it made the amp louder,but did not add any breakup. With single coils you have to turn this thing up to 10-12 to get it to breakup at all. With my Les Paul it will breakup sooner but it's not a very pleasing warm overdriven sound. I did change out the 5y3 tube with A GE NOS hoping for better breakup. I think the 8" celestion is not a very proficient speaker, and could be a good place to start experimenting.
The cathode cap suggested would help that. Odd. My GA-5 seems nicely hot. Is it the AX7, 6V6 Tubes ?
 

NMore

Tele-Meister
Joined
Dec 8, 2017
Posts
345
Location
Castle Rock
OK now that I am thinking about this I remember putting in a 5AR4 tube in the rec which would give it more output. I think I'll put the 5y3 back in and try that again.. :D Sometimes it just takes some posting outloud.........:confused:
 

Teleterr

Friend of Leo's
Joined
Feb 7, 2011
Posts
4,683
Location
Lewes De.
OK now that I am thinking about this I remember putting in a 5AR4 tube in the rec which would give it more output. I think I'll put the 5y3 back in and try that again.. :D Sometimes it just takes some posting outloud.........:confused:
And possibly less current starvation distortion. Shut off distortion is smoother sounding and less noticable.
 

archetype

Fiend of Leo's
Joined
Jun 4, 2005
Posts
11,525
Location
Western NY
My problem with this amp is that it is too clean. I did the C7 upgrade and it made the amp louder,but did not add any breakup. With single coils you have to turn this thing up to 10-12 to get it to breakup at all. With my Les Paul it will breakup sooner but it's not a very pleasing warm overdriven sound. I did change out the 5y3 tube with A GE NOS hoping for better breakup. I think the 8" celestion is not a very proficient speaker, and could be a good place to start experimenting.

You might try reducing negative feedback by increasing the value of the NFB resistor. I can't find a schematic for the Joyo, but on a tweed Champ the resister is 22K Ohm. You might try lifting the resistor to take it out of the circuit and see what the result is.

I'd try NOS for the 12AX7 and 6V6-GT. Nearly any brand will sound good in there.
 

NMore

Tele-Meister
Joined
Dec 8, 2017
Posts
345
Location
Castle Rock
You might try reducing negative feedback by increasing the value of the NFB resistor. I can't find a schematic for the Joyo, but on a tweed Champ the resister is 22K Ohm. You might try lifting the resistor to take it out of the circuit and see what the result is.

I'd try NOS for the 12AX7 and 6V6-GT. Nearly any brand will sound good in there.
Yep that might be worth a try. The Ruby 6v6 tube actually sounds really good. I have a NOS GE and a Sylvania 6v6 that really do not sound any better in this amp. Possibly a differnt ax7 though. First thing I am going to do is put the 5y3 back in and see what that gets me. Thanks
 
Top