First built - 5F1 - works right away!

Little Jay

Tele-Holic
Joined
Jul 20, 2009
Posts
530
Location
The Netherlands
I have some experience modding, repairing and maintaining tube amps, but never built one form scratch. So the COVID lockdown was the perfect excuse!

I had a 4 ohm Jensen P10R and some IKEA-shelves laying around, so I ordered a kit (chassis only) from a Dutch electronics shop (https://www.jukebox-revival.nl/) and off we go!

The built was simple enough, but man, a 5F1 chassis is cramped! The cab is simple: just glued with dowels and some reinforment slats on the inside. I don't have the tools or the space the make finger joints or dove tails.

I did change one thing: the elco of the preamp (the last or first one, depending how you look at it) was grounded only with a wire to the ground lug of the input jacks, and thus only through the mechanical connection of the jack to the chassis (the other two elco's were grounded with a seperate wire with a lug on one of the PT-bolts). This seemed a bit strange to me: if the jack comes loose, the elco is grounded thru the guitar strings and the player! Not a good thing imho, so I connected that elco also to ground of the other two elco's. While this may result in a ground loop in theory, the amp is very quiet and only with volume past 75% some hiss and the tiniest hum is audible.

And it worked right away on the first start up!

I am very surprised by this little 5 watter! It sounds great and has a lot more volume and clean headroon than I expected. Great for practise at home, but I can see myself doing the occasional coffee-house gig with it!

The finished product:
7CT7rdA.jpg


My DIY ES-330/Casino sounds simply superb through it!
uOaaRiH.jpg


Unfinished cab:
N6jPoOU.jpg


Some gut-shots:
NxpeG3Y.jpg


o6fYUWS.jpg


9lCPkqH.jpg


VDMDA1G.jpg
 

King Fan

Poster Extraordinaire
Ad Free Member
Joined
Jan 1, 2013
Posts
9,064
Location
Salt Lake City
Good for you. As D'tar says, enjoy. And hey, if TDPRI is any sample, works great on fire-up isn't a universal experience, so feel extra good.

For future builders reading your post, grounding at an input jack is best done with a star washer under the jack. But there're several quiet ways to do the ground scheme on these little Fenders, and it sounds like yours works fine.
 

Mongo Park

Tele-Afflicted
Joined
Nov 28, 2010
Posts
1,439
Location
Winnipeg
Beauty, glad you are up and running right out of the box. Your can looks fantastic, these small amps always are much bigger with a big speaker and cab. It is to bad Leo and friends didn’t/couldn’t do the same. I think economic pressures prevented it.
Cheers Ron.
 

Little Jay

Tele-Holic
Joined
Jul 20, 2009
Posts
530
Location
The Netherlands
In spite of the 10" speaker the cab almost has the exact same dimensions as that of the 8" Champ! It's only a little deeper at the bottom, creating a more angled baffle, which makes the speaker tilt back a little more and points the speaker magnet down a little, so it's not in the way of the tubes or trafo's.

With my Boss FRV-1 it sounds amazing!
 
Last edited:

ping-ping-clicka

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Joined
Jun 28, 2019
Posts
9,640
Location
left coast
I have some experience modding, repairing and maintaining tube amps, but never built one form scratch. So the COVID lockdown was the perfect excuse!

I had a 4 ohm Jensen P10R and some IKEA-shelves laying around, so I ordered a kit (chassis only) from a Dutch electronics shop (https://www.jukebox-revival.nl/) and off we go!

The built was simple enough, but man, a 5F1 chassis is cramped! The cab is simple: just glued with dowels and some reinforment slats on the inside. I don't have the tools or the space the make finger joints or dove tails.

I did change one thing: the elco of the preamp (the last or first one, depending how you look at it) was grounded only with a wire to the ground lug of the input jacks, and thus only through the mechanical connection of the jack to the chassis (the other two elco's were grounded with a seperate wire with a lug on one of the PT-bolts). This seemed a bit strange to me: if the jack comes loose, the elco is grounded thru the guitar strings and the player! Not a good thing imho, so I connected that elco also to ground of the other two elco's. While this may result in a ground loop in theory, the amp is very quiet and only with volume past 75% some hiss and the tiniest hum is audible.

And it worked right away on the first start up!

I am very surprised by this little 5 watter! It sounds great and has a lot more volume and clean headroon than I expected. Great for practise at home, but I can see myself doing the occasional coffee-house gig with it!

The finished product:
7CT7rdA.jpg


My DIY ES-330/Casino sounds simply superb through it!
uOaaRiH.jpg


Unfinished cab:
N6jPoOU.jpg


Some gut-shots:
NxpeG3Y.jpg


o6fYUWS.jpg


9lCPkqH.jpg


VDMDA1G.jpg

Congratulations and very well done . Looking at the fiddly bits inside everything is so net and clean, it reminds me of a look of a High Watts gutty-watts. Your skill set is showing.

000 My pet rock as a doggie wog.jpg
 

Little Jay

Tele-Holic
Joined
Jul 20, 2009
Posts
530
Location
The Netherlands
I never posted the video I made of the sound of the Champ, so here it is!



(The Champ sits on the floor, not visible. I recorded with an SM-58 into a small mixer and from there into my iPhone X with the help of an iRig)
 

jmp81sc

Tele-Meister
Joined
Feb 6, 2015
Posts
454
Location
Orange County
DIY Guitar and amp, plus you can play really well!!! Such a tidy build, great attention to detail. Maybe separate you V1 cathode resister from the capacitor as that can get hot.

Planning your next build yet?
Take Care
John
 




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