05-04-2024, 11:03 AM
Hi Adam,
Yes is a great pity that the rebuilding of the 15GP22 proved unfeasable. It’s easy to overlook just how difficult it was to build these tubes in the first place and that they were never rebuilt at the time even with the fully equipped rebuild facilities that there would have been back then.
I’m not sure what I’ll do if the 15GP22 proves to be a dud. It would of course be possible to place a ‘modern’ CRT in there behind a fake mask and use the chassis of the CT-100. When I was doing work on the chassis of my set I used a test CRT unit from the period, it comprises of a CRT and scan coils and a bunch of adapters to ‘simulate’ a large range of tubes from the period, including the 15GP22.
For the Pi5 and standards, I suggest you post your request in the Raspberry Pi forum. If you search ‘obsolete’ you’ll find the thread. I’m sure 441 would be very straightforward. I see the potential of the pi5 as a media server, particularly if a modulator HAT is made for it. I’ve just ordered a cheap i2s DAC board to see if that can be the source of the audio. The modulator circuits are straightforward, and I2C available, though one of the modulators would need an address shifted in front of it.
Having said all of that, I think there is a special romance attached to a digital standards convertor. I’ve now got 5, a Pineapple, two Auroras, and two of Frank C Hedghogs that were fun to build and give excellent results. So I see collecting standards converters as a subset of the hobby!
Mike
Yes is a great pity that the rebuilding of the 15GP22 proved unfeasable. It’s easy to overlook just how difficult it was to build these tubes in the first place and that they were never rebuilt at the time even with the fully equipped rebuild facilities that there would have been back then.
I’m not sure what I’ll do if the 15GP22 proves to be a dud. It would of course be possible to place a ‘modern’ CRT in there behind a fake mask and use the chassis of the CT-100. When I was doing work on the chassis of my set I used a test CRT unit from the period, it comprises of a CRT and scan coils and a bunch of adapters to ‘simulate’ a large range of tubes from the period, including the 15GP22.
For the Pi5 and standards, I suggest you post your request in the Raspberry Pi forum. If you search ‘obsolete’ you’ll find the thread. I’m sure 441 would be very straightforward. I see the potential of the pi5 as a media server, particularly if a modulator HAT is made for it. I’ve just ordered a cheap i2s DAC board to see if that can be the source of the audio. The modulator circuits are straightforward, and I2C available, though one of the modulators would need an address shifted in front of it.
Having said all of that, I think there is a special romance attached to a digital standards convertor. I’ve now got 5, a Pineapple, two Auroras, and two of Frank C Hedghogs that were fun to build and give excellent results. So I see collecting standards converters as a subset of the hobby!
Mike
