5f1

  1. theprofessor

    Back to basics - 5f1

    I started building amps for fun a few years back with a 5f2a, yielding a thread of epic proportions for such a small amp. I had a lot of questions, and folks were kind enough to pitch in. I hope that, despite its absurd length, that thread has been helpful to others. I then went to a 5e3 tweed...
  2. A

    [newb] learn from my Variac mistake.

    Hey all, I'm a modder that just "finished" my first 5f1 build. Still a small issue to diagnose, but that's another topic. So I fired up my shiny new Variac (the low budget model of course. I brought it up slowly and low and behold, I had a working amp!! So now it was time check my b+ voltages...
  3. Jerry garrcia

    5F1 possible 5Y3 or socket problem

    Hi. Did something stupid. Had nothing to do since I was waiting for some parts for a build. I tore down my “Champ” and resoldered it all to get a better visual appearance. When I started it all up the lamp and rectifying tube glowed like the star from the bible. Everything was silence and no...
  4. heatx

    '57 Custom Custom Champ Reissue - P2P Modified by Franklin Amps

    When I was in the market for a 5F1, I was considering purchasing one of the P2P wired Champ clones that Frankyn Amps puts out, but ultimately went with the Fender because of the name. Simple as that. After receiving the Fender, I was running into weird sympathetic vibration issues with the amp...
  5. heatx

    5F1 Chanp as a Pedal Platform…

    I’ve made a few posts about the ‘57 Custom Champ I picked up a few months ago. I’ve been loving it. Changes to the stock amp are: - Full set of NOS RCA Tubes - Jensen P8R - Evidence Audio Siren II Speaker Cable I know this isn’t common, but I’ve been experimenting with it in the studio as a...
  6. heatx

    '57 Custom Champ "75 Years" New Weber Speaker?

    Hello all, I'm mainly a lurker here on TDPRI, but I've learned a ton and enjoy the conversation. Just wanted to chime in here because I haven't been able to find this mentioned anywhere. I picked up a brand new '57 Custom Champ last week and noticed, after pulling the amp out of the box, that...
  7. Archie343

    First Home-Built Amplifier!

    This week, I finished my first tube amp build; naturally it's a 5F1 clone. I did however modify it to have a bypassable tonestack and a 'one tube' reverb. 10/10 Lockdown project for anyone at home and bored out of their minds. The amount of advice and information available online blew me away...
  8. benjamburns

    5F1 - Speaker Load Damage

    Hey all, First post! I've gleaned a lot of valuable info from many folks here, so thank you all for your generosity. I finished a 5F1 build last month (Boothill, everything was great, thanks Dave!). 15W Classictone OT to a 4ohm 10" Alnico from Weber. Sounded really nice. That is until my...
  9. pugnax

    5F1 transformers, tubes, and headroom - how and what to measure

    I'm building a 5F1 using the Hoffman layout. Because the ClassicTone transformers suddenly exploded in price, I ended up splurging a bit on some Mercury Magnetics transformers instead. I ended up with a FTCP-59-CT (330-0-330, 5V winding PT) and a FTW-CHMP-OS (the oversized 8Ω OT). I know it's...
  10. Little Jay

    First built - 5F1 - works right away!

    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...
  11. doof

    5F1 - 180v on V1 pins 1&6 too high?

    Hi everyone, I just put together a 5F1 using a Hammond 290AX PT and a Hammond 1760C OT. My voltages are within the 10% tolerance for the most part, except pins 1 & 6 on V1 are 185 and 181v respectively, so about 20 - 23% high. Is this high enough that I should worry? Or should I just shut up...
  12. T

    5f1 Clean Boost

    Am I correct in thinking that putting a clean boost on a 5F1 circuit is no different than turning up the volume knob on the Amp? Seems I can't get it to growl with out making it louder without bringing my own distortion to the table from a pedal.
  13. GratefulDean

    Fender Champ 5f1 power transformer question.

    I am looking at building a Fender Champ 5f1 from MojoTone. They were out of their power transformer, 760EX, when I was putting the kit together so I picked up a Classic Tone 40-18112, which both Stew Mac and Classic Tone said would work in the amp. Now that I am at the power transformer...
  14. smuc

    Who needs attenuation?

    ...when you have a 5 watt amp? ;) ever since I started playing tube amps it seems that as the time went by, the power of the amplifiers I have been using was always getting smaller. From the 100W Marshall stack and a Hot Rod Deville in the beginning, over the 22W deluxe and a 18W Marshall I...
  15. drew1d

    Princeton / Champ never seems to break up like "Layla"

    I've built a few and always get too much clean headroom. like no breakup all the way to 12. I figured it's because the voltages always seem too high. Like upper 300s on the power tube, and low 300s on the preamp. (Anode voltage) Any tips on getting that Layla sound, or is it recording mic...
  16. S

    Need help repairing a Fender Champion 600

    Hello everyone, First of all i'm new to this but really "thirsty" and willing to learn so go ahead.... Just got this Fender Champion 600. Don't really know where to start !? The guy that gave it to me tried to convert it to a blackface Champ but stopped during the process. He bought an...
  17. Sylas Wojo

    Critique My 5F2A Build

    In this thread I'll be posting my Princeton 5F2a build, feel free to give me advise, tell me if I'm doing something wrong, what I could do better... Here Ill be documenting my process, so stay tuned!
  18. stev

    Boot Hill 5F1 - first amp build...what next?

    Just wanted to say "thank you" to this forum for all the great build threads that made my first amp build pretty straight-forward. In particular I appreciate all the posts across several threads that recommended sticking with an 8 inch speaker (Weber Alnico Signature 8S in my case). I'm sure...
  19. Big Fred

    A 5F1 for both guitar and bass?

    Hi guys, I have a newbie question: I am planning my first tube amp build, and I have been studying Robrob's site for a while. I would like to build a micro 5f1. I also play bass sometimes, so I was thinking of modding the original plan so I could use it also for bass. I have searched on the...
  20. Sylas Wojo

    5F1 Champ Build

    Hi, I'm trying to gather all of the parts to build a Fender 5F1 Champ amp (My first build). What do you guys use for Power and Output Transformers? I was following the mojotone build guide, and the 2 transformers they suggest are out of stock. It seems like buying all the parts separately is a...
  21. T

    5F1 Mojotone Voltages Too High and Dual Voltage Issue

    I am stuck in the USA because of Covid-19, I usually live in Zambia. (This is important due to voltages) I just built a Mojotone 5f1 Amp and I love it but the voltages are a bit high and it red plates the 6v6 some and misbehaves when I run it too long (an hour or two), it makes really loud...
  22. 72_Custom

    Did I Just Blow Up My OT?

    I'm working on converting an Epiphone Valve Junior into a handwired 5F1 Champ with a solid state rectifier (as I'm trying to reuse the existing transformers). During the initial startup/testing procedure, everything checked out OK without tubes and then with only the 12AX7. Finally, when I...
  23. itsGiusto

    Princeton Switch on Tweed Champ Increases Volume - Why?

    I recently added a "Champ - Princeton" switch on my homemade 5F1. It basically takes the amp from being a 5F1 to a 5F2A by adding in a tone control. See Sw2 in this schematic. It sounds great, and I'm very happy with it. The only thing that's weird that I don't understand is that when I...
  24. Tele Slacker

    Foil on 5f1 Chassis cover and buzzz

    Recently finished a 5f1 circuit in a Mojo chassis, custom cabinet (more traditional 5f1 dimensions), Hammond xformers, Weber Sig speaker, etc etc. The build was typical (similar to ship building in a bottle!), and everything tested out textbook. Hours of break-in with Coltrane running thru it...
  25. PorkChopExpress

    First 5F1 Build

    Posting some photos of my recent 5F1 build. Everything from the neck pickup on the Tele to the P-90 in my LP Jr sounds killer. I love this little one knob ripper - although my wife already let me know it's too loud for the house :D This is my first amp build. I hadn't done much soldering...




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