Sorry to jump in on this thread.
Terrific reading by the way with great build photos -- thanks! -- and it's really given me the urge to try an F5 build as my next project. I built some Mini A's a few years ago (they're in storage right now) but havent been here in ages and havent done any DIYing either.
The F5 looks like a great build and I spotted AudioSan's post on using a transformer with 15v secondaries -- which I can take from my Mini A's. I would love this as it would save quite a bit of money. But I'm really a beginner, so have to ask if there would be big changes in the circuit using a 15v toroid instead of an 18v ???? Also, what would the approximate output power be? My Mini A's were around 10w into 8ohms IIRC and I never felt I lacked power!
Thanks for any advice!
hello. no changes needed in the circuit. output will be around 17-18W at 8ohm and 1-1.1A bias to make it stay in classA.
Hi all,
Me again with still more problems 🙁
It took a while but I finally received new fjets (Q1 & 2) and installed them.(thank you Spencer)
At first turning P1 & 2 Igot no response. I turned off the amp and then turned on again and R12 started smoking...
Please help- what's next? Changing Q4?
Me again with still more problems 🙁
It took a while but I finally received new fjets (Q1 & 2) and installed them.(thank you Spencer)
At first turning P1 & 2 Igot no response. I turned off the amp and then turned on again and R12 started smoking...
Please help- what's next? Changing Q4?
Review the back of the pcb, burned the R12 is likely to have burnt some clue circuit...
Sorry for rushing in:
I replaced ZTX450 with BC550. ZTX is CBE, while BC is EBC. Is this correct??? Just turn the transistor???
Regs, Dirk
I replaced ZTX450 with BC550. ZTX is CBE, while BC is EBC. Is this correct??? Just turn the transistor???
Regs, Dirk
Six F5 together with power supply SMPS
Presenting the assembly of six units F5 in one case. The result is very good for use in mids and highs - multi amplification system.
Invite friends and users look: https://www.facebook.com/media/set/?set=a.259949857464151.61011.100003474163418&type=1
Presenting the assembly of six units F5 in one case. The result is very good for use in mids and highs - multi amplification system.
Invite friends and users look: https://www.facebook.com/media/set/?set=a.259949857464151.61011.100003474163418&type=1
Attachments
I am surprised how small the smoothing is.
I think I can read 22mF. Is that 22mF*3 per rail? For all six F5!
I think I can read 22mF. Is that 22mF*3 per rail? For all six F5!
Yeah AndrewT - well, I'm not technical nor designer. Just like to know how to handle audio and solder and screws. Follow some rules and just turned on the amp.. Heats much but works very well. Pat Metheny's guitar sounds better and interpretations of Mike Oldfield or Vollenweider are more vivid. Very good. I hope to continue working in Brazil have much heat.
6L6: I appreciate their recognition and transmit it to the important help of Mr. Stanton Tin and Jim Audio from China store.
Thank you for acknowledging those people who helped you with your build - this community cannot survive without the free interchange of ideas and assistance to those whom are interested in learning through DIY. 😀 😀 😀
Please honor them by helping another who would like to build an amp of his own! 🙂
Please honor them by helping another who would like to build an amp of his own! 🙂
6L6 Thanks for helping me get my F5 build going. I keep coming back to this post and the pictures when I am puzzled on the details. I have most of the parts - ready to start the physical chassis stuff. DIY Store 4U Deluxe chassis is nice - wish they nicer feet. Cheap plastic - any ideas for decent chassis feet?
I have started to slide down a very slippery slope. B1 boards on the way. Pearl 2 boards on the way. My 30 year old Yamaha turntable is not nice enough (according to my wife) to bring into the living room - had to upgrade to a Rega RP1 with the Performance Pack. 🙂
I have started to slide down a very slippery slope. B1 boards on the way. Pearl 2 boards on the way. My 30 year old Yamaha turntable is not nice enough (according to my wife) to bring into the living room - had to upgrade to a Rega RP1 with the Performance Pack. 🙂
I didn't like the plastic feet either. I used these..
729 Keystone Electronics | 729K-ND | DigiKey
worked out fine.
Lol, yes, the feet are awful. I have no good suggestions, unfortunately...
You are going to do a Pearl! That's awesome. You will want to get a good cartridge next, methinks. 🙂 🙂 🙂
You are going to do a Pearl! That's awesome. You will want to get a good cartridge next, methinks. 🙂 🙂 🙂