Project Redwing (300B) is Go!

[Thermionic Idler]

PCB's and tag boards now in place in each chassis, only thing missing is the interstage which fixes between the two 300B sockets, where the nulling pot used to be.





And the power supply first stage PCB's attached to each power transformer:

[Thermionic Idler]

Bit more progress - heater wiring now in place along with the mains connections.

I was able to verify that standby and remote power-up worked as expected, triggering the power relay and lighting up the heater on the 12SN7 at the other end of the chassis when turning on the pre-amp. The KT88 heaters will each be powered from the 6.3V secondaries on the HT transformers, so those are not connected yet.

I got the heater wiring from https://twisted-pair.co.uk/ - 20 and 22 AWG, comes in loads of different colours and saves having to twist the damned stuff yourself (probably my least favourite task). Sold as CAN bus cable but to me it looked perfect for the job. I used a 20AWG line to each 300B and KT88, 22AWG for the 12SN7 as its heater only draws 300mA.

[Nick]

saves having to twist the damned stuff yourself

Only takes seconds using a electric hand drill and bench vice.

[Andrew Ivimey]

Ha ha! I discovered the drill method accidently and then considered, well, why not! A nice application of a slowish drill speed and I can wind heater wire that can stretch to the Isle of Dogs.

[Dave the bass]

Ha ha! I discovered the drill method accidently and then considered, well, why not! A nice application of a slowish drill speed and I can wind heater wire that can stretch to the Isle of Dogs.

<sound FX BUZZER> Over-ruled! The Isle of Dogs is located on a serpantine bend on the Thames....ergo, you'd have to have a big curve in your heater wiring ... unless you're winding in a straight line from Bedders to Dogs.

Slow drill in Bedford, vice on the Isle of Dogs?

Cor!

[shane]

vice on the Isle of Dogs

I wouldn’t be surprised…

[Dave the bass]

vice on the Isle of Dogs

I wouldn’t be surprised…

Arf! Comedy gold

[Nick]

unless you're winding in a straight line from Bedders to Dogs.

You are assuming that's where he is starting from. He never said that...

[Dave the bass]

unless you're winding in a straight line from Bedders to Dogs.

You are assuming that's where he is starting from. He never said that...

<BUZZER> over ruled!

On Mr I's post theres a location given of Bedford. "Location: Bedford"

See! Ha! So there, <insert raspberry sound>....etc etc etc.!

[Nick]

I was about to reply to your raspberry sound and argue the case, but I have quelled my inner pedant and decided not to.

Though I have just replied to tell you I am not going to reply. Hmm.

[pre65]

On Mr I's post theres a location given of Bedford. "Location: Bedford"

No no no-yes, but.

being the avid traveller he is Andrew may not be in Bedford at any given moment. So there.

[simon]

Somehow the world seems a better place now Dave's back

[steve s]

Somehow the world seems a better place now Dave's back

Like !!!!

[shane]

Somehow the world seems a better place now Dave's back

Like !!!!

wise!!!

[Dave the bass]

Thank you all.

Curry night?!