WF-55 amplifiers
barry (Administrator) 05-16-2011 at 08:41 PM.
Post: #11
Nathan Tooke's WF-55 conversion

There are many small combo amps that make ideal donors for use with Amp Maker kits. This one looks and works really well, and was a perfect fit for the standard chassis.

"It's actually a replacement cab for a Harley-Benton GA5 (same as Epiphone Valve Junior I believe), but being no good at woodwork, I thought I would go for that. I bought it off Ebay! I have used a Celestion Super 8 speaker in it, just for reasons of cost really. I may upgrade to a Jensen."


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barry (Administrator) 05-16-2011 at 08:42 PM.
Post: #12
Andrew Ponder's tweedy WF-55

Andrew's another builder who opted for a tweed cabinet covering to reflect the WF-55 circuit's heritage. Like a lot of cabinet builder's Andrew found an easily available and affordable surce for the wood: - a B&Q pine shelf. It's completed with an 8inch Jensen speaker.

Note: For this style of chassis mounting, Andrew relocated the On/Off switch to the front panel. It's a lot more practical than the standard rear-mounted position.


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barry (Administrator) 05-16-2011 at 08:43 PM.
Post: #13
Richard Cruddas' unconventional speaker cabinet

He's at it again! Richard made an SE-5a amp a couple of years ago, and created a 'stop-gap' speaker cabinet out of the shipping box. Seems it wasn't a stop-gap after all - it's now featuring in his WF-55 project.

"I've attached a pic in which you may recognise an 'old friend', sadly not covered in gaffa tape and stickers yet but still sounding good. It's filled with the bubble wrap packing as damping."

UPDATE: Richard has done the decent thing and put the WF-55 in a cab (below). "Cab is from Chris. Just fitted a Celestion G12 Century Vintage - replacing an Eminence Rajin Cajun. Even using the 10" cut-out it sounds fabulous! So good in fact I doubt if I will bother making a new baffle. Sweet/clear/dynamic/ etc..... if you ever get the chance to try this set-up your in for a treat!! Can't believe how good this sounds. Such a simple clean circuit; who needs anything else when it works like this?" Smile

Richard has also added a switch on the front panel to lower the power output to approx 1/2W, and also added some extra capacitance in the power supply "to stiffen the power supply for more bass 'slam'. 4W ain't supposed to be this loud!!"


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barry (Administrator) 05-16-2011 at 08:44 PM.
Post: #14
Colin Parker's EVJ refit

Colin chose an old Epiphone Valve Jr combo for his WF-55. "The amp sounds great, far better than the Epi Valve Junior. Thanks for giving me the opportunity to build the amp and for having the patience to help me sort it. It has to be one of the best sounding amps I've heard. I will now go forth and spread the word."

UPDATE: Colin later modified his WF-55 with a simple tone control - effectively turning the Champ circuit into a tweed Princeton circuit. "I fitted the tone control to the amp last night, it sounds fantastic, but with more versatility. I absolutely love the amp, It's a keeper for life. Thanks once again for giving me the opportunity to own one of the best sounding amps I have ever heard."


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barry (Administrator) 05-16-2011 at 08:45 PM.
Post: #15
Steve T's modified WF-55

"I recently purchased the amp kit with the aim to build a reasonable facsimile of a black-covered 1964 version of the Fender Champ. The project is now complete and the mod of an extra input for lower output pickups has been successful. The photo's show the finished unit, the logo SH is for Steve's Hybrid or SHIRLEY (due its brassy chassis) and sounds just as smooth as the singer herself."


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barry (Administrator) 05-16-2011 at 08:46 PM.
Post: #16
Andy Mazur's switched-on Champ

As-standard, the Champ's circuit is low gain. It growls with overdrive only when the amplifier's Volume pot is wound up. Andy wanted more gain options for his WF-55, and the result is this. There are switches for adding cathode bypass capacitors to the preamp valves for more gain, a Princeton-style Tone control, a feedback-defeat switch and also a 3-way power switch (which I'll soon document in the WF-55 pages).


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barry (Administrator) 05-16-2011 at 09:18 PM.
Post: #17
Fitzjames Wood's WF-55 clip

No picture of this one, but Fitz' track is a great example of a Champ-style amp playing its part in a track.

"I love this little amp. I put mine in a wine box with a Weber 8" ceramic speaker. It looks like Seasick Steve's next amp (very rough looking in other words). Here's one of my songs with it on. Close miked with a Sennheiser 251 (grey one vintage) and no effects."

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barry (Administrator) 05-16-2011 at 09:44 PM.
Post: #18
Scott Charbonneau's blonde mini-stack

"I completed my amp yesterday and thought I'd pass along a few pictures! I decided to go with making a head and speaker cabinet separately. Overall I thought the cabinet building process was pretty enjoyable (except for putting that frustrating tolex on!). I think it turned out pretty good... especially since this was my first time doing something like this and working with a lot of the tools used.

"I made the head cabinet from scratch so I'm pretty proud of that! For the 1x12 speaker cabinet, I modified an old combo amp I had. Somehow, everything came together pretty nicely!Thanks again for all your help and offering such a cool, diy amp service! I find it pretty surreal to know that I built something this neat!"


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barry (Administrator) 05-16-2011 at 09:59 PM.
Post: #19
Dom's WF-55 with reverb!

Every now and then I get asked about adding reverb. It's now a FAQ (see here: add link here), but here's how one customer tackled it. "Please find attached photos of my WF-55 with reverb. I’ll post these on the music electronics forum in a few days when I have more time. I might also wait til I’ve tweaked it a little."

It uses a small sub-chassis attached to the WF-55's main chassis, with an ECL82 valve to drive the reverb and recover the signal. "I decided to put both high-voltage wires through one hole, the signal in/out through another and the heater pair through a third. Probably ought to fit a bypass switch on the reverb? Might be useful to fully switch it out the circuit (not just ground the reverb send). I’m guessing I’ll not recover a lot of the gain with the reverb circuit in. I’d hoped the triode and pentode stages would make up all the lost gain through the reverb tank."


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barry (Administrator) 05-16-2011 at 10:10 PM.
Post: #20
Mick Purchase's tweaked WF-55

Mick's first WF-55 was in a blue cabinet shown earlier in this gallery, and I persuaded Mick to sell me the cab. "Since you acquired my blue cab for the WF-55, I've rebuilt it as a classic '57 Champ complete with accurate Tweed cab and Jensen speaker. Chassis is bent up from a 250x250mm off-cut of aluminium. Great little amp and really looks the part. Improved the sparkle with a 2.2uF bypass cap on the first triode cathode, added 1k 3watt screen resistor; else all as per kit."


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