This model requires a 112A output tube, hence the 135 B+ AMP voltage.
Finished restoring my Grebe Synchrophase radio from 1926. Here is a video of the radio running using a crappy indoor antenna in my basement. Despite that I was able to pull in WBZ in Boston, which is approximately 700 km away. One thing to note if running this radio from an ARBE-III. The connection diagram in the book is not accurate. It was missing the -4.5V and +90V lines for some reason. The -4.5V C supply is tied to the ground in the radio itself. Note the changes in RED below.
This model requires a 112A output tube, hence the 135 B+ AMP voltage.
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While I am waiting for stain and clear coat to dry on my Grebe Mu-1 cabinet, I decided to see if I could not make reproduction cards from the obviously water stained originals. I do have some of the Radiola Guy reproductions, but they are not quite the same as these originals. The colour is off and in the case of the card from the inside of the cabinet, the size if totally wrong.
Click here for a PDF of these two cards so you can print them out yourself. My Grebe Mu-1 cabinet after stripping the old finish off. The images don't show the lovely red from the mahogany.
My Grebe Mu-1 (from 1926) is coming together nicely. I had to replace the wooden breadboard as the original was water damaged. There are a few more things I need to do and then I should be ready for some testing.
Recapped capacitor from my Grebe Mu-1. The hardest part was painting the blooming thing. I had to strip the paint 3 times before I got it to work correctly. The spray paint these days seems to really suck. Got some strange bubbling. Ended up switching to another brand.
After that it looked just like new. Got some more European tubes (for my Kerkhof 30-line Baird Compatible television project). There are a few more I need, but I have enough for the CRT receiver unit itself. The ones I received today are two 4690's (Thyratrons), AF2 (pentode), E443H (pentode) and an E499 (triode).
I have made up a new breadboard for my Grebe Mu-1 and gave the escutcheons some gold lacquer. I think they look pretty good.
Tonight I started to work on my Grebe Mu-1 Synchrophase. I bought this radio back in 2007 for about $155.00. The radio was missing the chain drive gears for some reason. Yesterday I received a spare front panel with tuning caps including chain tuning mechanism for $50 US. I already have a buyer for the remainder of panel once I am done with it. So in total it will cost me only $15 USD to fix my chain drive.
So far got quite a bit of progress on my Grebe Mu-1 this evening. Looks like I should probably replace the breadboard as it is a little funky. The outer layers of the plywood have delaminated and are warped. Fortunately I have essentially the same type of plywood and with a bit of staining, it should look like the original. I should be able to transfer the hole patterns from the original without too much difficulty. |
AuthorCharles Baetsen holds a Bachelor and a Master's degree in Engineering Physics from McMaster University in Hamilton, Canada. Archives
February 2024
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