F5m Giveaway Spectacular
In Memory of Mark Ozdoba (Toys4Boys)
In Memory of Mark Ozdoba (Toys4Boys)
_____ **___This giveaway ended on March 16, 2025 __**_____
Congratulations to Abx74 as the winner!!!!
Everyone loves a good giveaway. This giveaway is Honoring our diyaudio colleague Mark Ozdoba { @Toys4Boys }, who passed away in September of 2024. Mark and I both got into diyaudio around the same time, and we made a connection as we learned and shared knowledge building our first Pass DIY amps.
This is in fact Mark’s F5m kit (Essentials, Completion, PSU) and I’ve added in nearly all the additional parts to finish a complete amplifier. The only items needed are a chassis and a transformer.
Mark would love knowing his kit (which is from the first round of kits sold in the diyaudiostore in March 2024) would be built, so it can play glorious toe tapping tunes.
I’m politely requesting that this go to a newer builder. Please don’t enter if you have a stable of amps. It would be great to see this go to someone who’s relatively new to diyAudio that would benefit from all the additional bits and pieces included.
I will cover shipping in continental USA and will take off $10 from total shipping cost for international shipping.
To Enter: Just copy the list in the most recent post, add your diyaudio surname/alias at the bottom of the list, and post (country is optional, always fun to know where you reside)
Rules: I will leave this open for one week. On the evening (in Seattle, USA) of St. Uhro’s Day I will enter all the names into a spreadsheet and randomize. The entrant at the top of the randomized list will be the winner.
Here’s what is included:
- F5m Essentials Kit (PCBs, JFETs, & MOSFETs)
- Also includes 4qty Keratherm 86/82 Insulator pads, 4qty 3/4" fender washers, belleville locking washers, and M3 bolts to secure MOSFETs to heatsink
- F5m Completion (all the parts to complete the F5m PCBs and additional hardware)
- Nelson's V0 PSU Kit (all the parts to complete the PSU)
- 2qty 4.7ohm Epcos B57236S0479M000 thermisters included for higher biasing using the V0 PSU board per F5m article
- 2qty rectifiers (non metal case)
- Rhthatcher snubber PCB
- 2qty 0.15uF, 2qty 0.10uF film caps, and 2qty 22R resistors (ideal for Antek AS series)
- Rhthatcher soft start board (technically this isn’t necessary, but included to make hookup easy)
- 6qty male 0.250" spades, 2qty CL-60 10R thermisters, & 3300pf X1Y1 safety cap
- 3D Printed Transformer Seat Kit (works with 300VA or 400VA Antek AS/AN series)
- LEDs for front panel with wires already attached and 22k resistors (blue of course)
- Neutrik NF2D RCA inputs (silver body with one black RCA, one white RCA)
- Power Entry Module (Shurter 4304.6090)
- Includes 2.5A, 3A and 10A fuses
- Premade 14Ga Safety Ground Pigtail with eyelet and 0.187” female spade (soldered on to PEM)
- Twisted heat shrink 16Ga AC mains wires with 0.187” spades installed for PEM connection.
- 4qty speaker binding posts
- Input Wire for Signal (3 dual conductor options included to choose from)
- CAT8 ethernet twisted pair 3ft (has aluminum tape wrap around twisted pair)
- Mogami W2381 3ft
- 22Ga solid twisted pair 3ft
- 16Ga wire in variety of colors (~4ft of each color)
- Variety of 3:1 adhesive lined heat shrink colors and sizes
- 18qty Female 0.125” Spade Connectors (crimp on w/heat shrink insulation built in)
- 8qty Brass Hex Standoffs for amp PCBs (4mm with 4mm threads)
- 4qty Brass Hex Standoffs for PSU (6mm height, bolt on both sides)
- M3 hardware (for hex standoffs, PEM, Neutrik NF2D, MOSFETs)
- M4 hardware (w/locknut for rectifiers)
- 4qty 3D Printed Wire Posts
- Lots of Zip Ties
- 10qty stick on 3M wire anchors
- 4qty bolt on nylon “P-loop” anchors
- 5ft Cardas Quad Eutectic Solder
- Flush cut diagonal cutting tool
- 2qty 3D printed resistor benders (for small and large resistors)
Winner will need to procure:
- A suitable 18VAC or 20VAC Transformer (such as recommended AS-3218)
- A suitable chassis. I recommend the Deluxe 4U or, 3U. The new version will be in the store soon.
Tools Needed:
- Soldering Iron
- Heat Gun
- Multimeter
- Hand Tools for M3 and M4 Hex Bolts
- Something to crimp the female spades (vice grips works in a pinch, something like this is better)
- Dim Bulb Tester (DBT) and/or Variac
Special Thanks goes out to:
- Mark’s family for helping get his diyaudio kits out into the world to be enjoyed.
- Jose (Jacruzer787) for his support and feedback on this giveaway.
- Patrick (ItsAllInMyHead) for his support and feedback on this giveaway, and an amazing F5m build guide.
- Papa (Nelson Pass) for providing this community with such a wonderful amplifier to build.
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Thank you for making this community what it is Dan!
Dan, a beautiful gesture on your part to honor your friendship with Mark😍. Thanks for all you do for the diy community. I have a stable so I will not enroll.
Myles
Myles
A good way to remember a friend. Loss of a person is a tough one to cope with. I wish you strength.
Fantastic gesture in honour of Mark Ozdoba. Privilege is the winner's. All the best. Thank you to everyone who has made this possible. I have never made a Papa amp with store bought kits/boards but make my own boards, let me this a try.