I compared the list from Chris with your list and noted that there is a difference with the C and D settings for 01A. Chris has C: 19 and D: 20. Your list C: 45 and D: 6. I have not yet retested my 01As yet but I hope that I did not damage my 01As with incorrect settings. This 945 is my first tube tester I bought on Ebay a year or so ago.
I retested some 01As and they're testing at between 15 and 10 on the green scale. I really appreciated you demonstrating the tube testing procedure. I've been following the instructions from Precision which I thought would be hard on the 80 rect tube by turning on and off the tester between tests. I thought that you had to use the tube merit button procedure which required pressing the off button to reset the buttons.
I found in the literature which came with the 954-G a "Form -- DRC (HK) SUPPLEMENTARY TUBE DATA Price $0.75". The settings for the 01A agree with Chris' Old Radio settings of A:3, B:5, C:19, D:20, E:1, F:1 Are these differences of C: 19 to C: 45 and D: 20 to D: 6 significant?
Hey Carl I thought I may have, but find it now. So a new video with an appropriate title, so you can find it with a Google search. And yes it is handy, I use it quite often.
Question: Need some advice from a knowledgeable expert. Would it be possible to add a ratio detector to a regenerative FM receiver or would the demodulator require a heterodyne setup with an intermediate frequency? I've made a rather nice transistor regen with an amplifier, but it's a bit scratchy. So, I'm wondering if it's possible to add a Foster Seeley or ratio detector circuit. I have some experience with an AM superheterodyne and I'm slowly working towards the more complex FM version. Another great video by the way!
I think you should be able to configure another detector to your circuit. My guess would be now you are using a single diode. A ratio detector usually has to diode's so pretty much it is detecting both halves of the signal making it louder. So the scratching us should also be louder. There is a possibility the diode you are using now and maybe other components in your detector circuit may be noisy. If you have a signal tracer you may be able to find where the noise is coming from.
Good question. I had the same question about mine. For my Precision 912, I first replaced C1 and the type 80 tube. Then I tested several known good tubes of various filament voltages to confirm good test readings. It seems to be working fine but when I get some time I will check the transformer voltages and the resistors. Joe
I open the tester and inspect the inside to see if anything is obviously wrong. Like burnt resistors or cracked capacitors or loose wires. If all is OK I put it on a variac bring the AC voltage up slowly watching the current. If the current is good I start testing very common cheap vacuum tubes, and compare the results with another tube tester.
hello sir i have a series 900 tube tester and i cannot find much info on it or even a roll chart cuz my model has no roll chart, any info would be much appreciated
I found this site for Precision tube testers, hope it has the information you need. If not, Chris' email is at the bottom of the page. oldradios.50webs.com/precision/
Thanks! I have a Precision 912. I don't use the roll because I downloaded the tube chart from the web. My chart doesn't have all of the tubes that are in your supplement. I downloaded you supplement and will make good use of it. Several Precision tube tester carts and manuals can be downloaded from: oldradios.50webs.com/precision/index.html Joe
I compared the list from Chris with your list and noted that there is a difference with the C and D settings for 01A. Chris has C: 19 and D: 20. Your list C: 45 and D: 6. I have not yet retested my 01As yet but I hope that I did not damage my 01As with incorrect settings. This 945 is my first tube tester I bought on Ebay a year or so ago.
I was very careful on all tube setting lists. I have over 15 1920's radio that use 01A's. My tubetester checks 01A's accurately.
My Tubetester is a 954 'G'
I retested some 01As and they're testing at between 15 and 10 on the green scale. I really appreciated you demonstrating the tube testing procedure. I've been following the instructions from Precision which I thought would be hard on the 80 rect tube by turning on and off the tester between tests. I thought that you had to use the tube merit button procedure which required pressing the off button to reset the buttons.
I found in the literature which came with the 954-G a "Form -- DRC (HK) SUPPLEMENTARY TUBE DATA Price $0.75". The settings for the 01A agree with Chris' Old Radio settings of A:3, B:5, C:19, D:20, E:1, F:1 Are these differences of C: 19 to C: 45 and D: 20 to D: 6 significant?
I did not find the roll chart for the earlier model of the 654 on Chris's site. I took my information off of the roll chart of that earlier model.
I remember when you made that secondary list.,, Really turned out handy. Always liked that tester.
Hey Carl
I thought I may have, but find it now. So a new video with an appropriate title, so you can find it with a Google search. And yes it is handy, I use it quite often.
Very cool as always. Just bought a Knight-Kit 83Y636. Looking forward to tinker with it.
Thanks
Question: Need some advice from a knowledgeable expert. Would it be possible to add a ratio detector to a regenerative FM receiver or would the demodulator require a heterodyne setup with an intermediate frequency? I've made a rather nice transistor regen with an amplifier, but it's a bit scratchy. So, I'm wondering if it's possible to add a Foster Seeley or ratio detector circuit. I have some experience with an AM superheterodyne and I'm slowly working towards the more complex FM version. Another great video by the way!
I think you should be able to configure another detector to your circuit. My guess would be now you are using a single diode. A ratio detector usually has to diode's so pretty much it is detecting both halves of the signal making it louder. So the scratching us should also be louder. There is a possibility the diode you are using now and maybe other components in your detector circuit may be noisy. If you have a signal tracer you may be able to find where the noise is coming from.
@@AllAmericanFiveRadio
Heads up to anyone who's interested: ntepartsdirect.com has 5W RF power transistors on clearance for $0.25.... that 25 cents!
Beautiful tester. I have a couple tester much less nice than that. My question is how would I know if my tester is good?
Good question. I had the same question about mine. For my Precision 912, I first replaced C1 and the type 80 tube. Then I tested several known good tubes of various filament voltages to confirm good test readings. It seems to be working fine but when I get some time I will check the transformer voltages and the resistors. Joe
I open the tester and inspect the inside to see if anything is obviously wrong. Like burnt resistors or cracked capacitors or loose wires. If all is OK I put it on a variac bring the AC voltage up slowly watching the current. If the current is good I start testing very common cheap vacuum tubes, and compare the results with another tube tester.
Always great content, thx for sharing.
Thanks
hello sir i have a series 900 tube tester and i cannot find much info on it or even a roll chart cuz my model has no roll chart, any info would be much appreciated
I found this site for Precision tube testers, hope it has the information you need. If not, Chris' email is at the bottom of the page.
oldradios.50webs.com/precision/
Thanks! I have a Precision 912. I don't use the roll because I downloaded the tube chart from the web. My chart doesn't have all of the tubes that are in your supplement. I downloaded you supplement and will make good use of it.
Several Precision tube tester carts and manuals can be downloaded from: oldradios.50webs.com/precision/index.html
Joe
Thanks for the information