09-18-2021, 11:22 PM
Thank you for the responses. I've been doing well, but maintaining our 106 year old house has been taking up a lot of my free time.
Yes, the speaker is not original and it does not have the prop 4-pin plug to fit into the unmodified chassis.
With that in mind, I have been on the hunt for an original. I thought I stuck gold with this one a few years ago and carefully stored it away.
[Image: https://live.staticflickr.com/65535/5148...04af_c.jpg]
[Image: https://live.staticflickr.com/65535/5148...c102_c.jpg]
Well, I finally got around to doing some basic resistance checks and discovered that it has a center tapped primary. That would indicate it is for the PP 45 or PP 47 version I believe ?
Now I'm thinking it might work OK if I use the outer primary windings and ignore the center tap. However, I've read that if the core is not gapped properly for single ended use it could saturate and distort. We shall see.
Meanwhile, I tacked in a new power cord and clipped out the old AC line bypass caps. A power up with no 80 tube installed was successful
All the other tubes lit up and I have around 700 VAC across the B+ secondary.
Yes, the speaker is not original and it does not have the prop 4-pin plug to fit into the unmodified chassis.
With that in mind, I have been on the hunt for an original. I thought I stuck gold with this one a few years ago and carefully stored it away.
[Image: https://live.staticflickr.com/65535/5148...04af_c.jpg]
[Image: https://live.staticflickr.com/65535/5148...c102_c.jpg]
Well, I finally got around to doing some basic resistance checks and discovered that it has a center tapped primary. That would indicate it is for the PP 45 or PP 47 version I believe ?
Now I'm thinking it might work OK if I use the outer primary windings and ignore the center tap. However, I've read that if the core is not gapped properly for single ended use it could saturate and distort. We shall see.
Meanwhile, I tacked in a new power cord and clipped out the old AC line bypass caps. A power up with no 80 tube installed was successful
All the other tubes lit up and I have around 700 VAC across the B+ secondary.
