F5 Turbo Transistor Kit

Really good boards and with lots of options. I went for single 5U x 400 UMS tapped Dissipante chassis, +/- 52V rails, cascoded jfets, source resistor diodes fitted, stability caps and higher resistance gatestoppers, (I dont want it going unstable). I also fitted a manually resettable 70 degree C thermostat in line with the mains supply and fixed to the right heatsink at the top, its a big amp and I think safety is important. Doubled up feedback resistors to to 4 x 470R @ 3W by fixing another pair on the back of the board, jfet source resistors upped to 11R and P3 fitted and centred for now. 2000VA Airlink transformer with 6 x 82,000uF/63V Kemet ALS70 psu caps and 15mm thick aluminium ground block. Only running at 1amp bias so far and yet to tidy up wiring loop area etc, will then bias up to standard 300mV suitable for MUR3020 doides and a reasonable chassis dissipation of 240W. So far this amp has big authority in the sound and super bass, I like it!
Big thanks to Diy Audio Store and especially NP, these boards make phenomenal circuits so accessible.

A wonderfully designed amplifier! These PCBs are easy to solder, feature clear writing and proper spacing. The circuit is easy to assemble with some patience- follow the guide/watch NocturneVid66's assembly videos, and you're off to a great start!

This build is a dual mono (common star ground) in a 500mm dissipante chassis. Biased to 300mV, it runs at approximately 115 degrees F while never exceeding 10mV of offset across either channel. I highly recommend the available thermal pads from the site as well!! I chose to cassacode as well as put caps on the output boards. Cassacode if your needs demand it, skip the caps unless you have HF osculation. Power caps are 22,000uF x 16 = 352,000uF total at 63v rails; all wire is oversized, and I soldered screw-down wire terminals for connections between boards.

I live in the UK, the boards JFETS and MOSFETS arrived within two weeks. The F5 Turbo is my most challenging yet surprisingly straight forward build to date. I used a 5U Galaxy enclosure and 2 X 625 VA Transformers 24-0-24v bolted vertically to the front panel it’s not pretty but functional. Thus the two large bolts in the front panel. Thanks to 6L6’s build guide the build was straightforward. I opted for the V3 build without the extra transistor. Care has to be taken with the components as the MOSFETS and diodes are identical. The biasing is a slow process but was eventually biased to 350 mV. The guide has excellent instructions. It sounds superb and slightly more dynamic than the normally aspirated F5 which also sounds superb. Thank you Nelson, 6L6 and all the team at DIY Audio.

Bought the boards from DiyStore in April 2018 and it was going to be next months project..... I eventually got to it about month ago and build it without any problems. Using a 30v Antek 800VA transformer to give me 41V DC and currently have it biased at 0.330v and monitoring the heatsink temperature which seems to be fine and sitting at roughly 50deg Celsius. After a couple of hours of playing it with the Noir pre-amp the sound settled and it sounding absolutely stunning now… a project well worth it and highly recommended!!!

I’m planning to pair this with the electrostats I’m building, but that’s for next month.

It has everything I need plus a bit more for my F5Turbo build. Can't wait to gather the rest of the items that I need to complete my Mono Block versions of the F5T.

As always beautiful looking pcb's .Can't wait to get started on this new project . F5-Aleph-j now the turbo,all my pcb's came from the diyaudio store Perfect guides from 6L6 makes it a breeze to follow,id like to take this opportunity to thank Mr.Nelson Pass and all the input everyone has left in the forum i found a plethora of information that left me with out having to ask for any help .Again thank you all.soon to come pics i hope lol.