You are reading a single comment by @Five-Hats and its replies.
Click here to read the full conversation.
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Five-Hats
Jonny69
I also found some 2N697 transistors for the driver stage. I specifically wanted transistors in the older metal cans rather than the more modern plastic ones. I guess these ones might be 1980s or 1990s but they don’t look earlier than that. What I didn’t seem to be able to find were any 2N3906 PNP transistors in an old-style can. The design notes mention that the most critical transistors in the design are the 697s but that the 3906s are not that important. I’ve got loads of 3906s at work because they’re just a cheap, general purpose PNP. so I figured I could probably use a couple of those to start with and swap them if a a couple of old 3906s or 4058s turned up.
I bought a couple of the cheap eBay JLH 1969 amplifier kits, cheapest ones I could find, with the plan to dump all the components and just use the PCBs and hardware.
For the capacitors, again, I wanted to use old ones. I had most of the big ones in my stash but not 100uF and 220uF Philips ones at high enough voltage, so I went on eBay and found some. Planned to use a couple of Mullard tropical fish ones from my stash for the input coupling and apart from the 3906 transistors in metal cans, I had pretty much everything I needed to get going.