16:40 I'll have to find that one. I only think of Humble Pie Rockin' the Philmore. (Philmore West music Hall I believe.... Not the Philmore stereo I have, 😆)
I love to watch you work ,you really good at what you do,and I love that you save as many radios and turn tables .I prefer the old stuff better ,a lot of the new stuff is a waste of money
Thanks. I would like to see you do a job from start to finish showing each step ( edited of course ) because you are good at explaining what you are doing to people who are beginners or intermediates.
A quick thank you for posting this video and schematic. I converted a single tube child's phonograph from 1950 and it sounds incredible. Great how to do it video Thanks again!
Hello Don and Brian; I agree with an external speaker. Thinking about doing that to my RCA 2US7 with push pull 35C5 output. Love the Video. It shows me Brian has a Great Knowledge. WB5KSM 73
That's a fantastic upgrade, might be worth it putting a better speaker in it now. Seems like this amp would work really well with the 0.9v P132D modern ceramic cartridges too, I just wish the connection pins weren't such junk on them.
I'm GLAD you posted this! It's gonna help me down the road when I get more back into repairing phonos again! I think it sounds WAY better keeping it a FULL TUBE amp, instead of adding a trans-sexual-sister and/or other solid state devices! Guess you COULD have gone one step further & added a 35W4 rectum-fire tube, too!
like all your videos.Hope to be able to try that preamp circuit with the many different old turntables I've aquired.Could use some ideas of what and where to buy some decent pickups to experiment with.
That chassis is rather interesting, it looks like three of the holes were punched to take a seven pin miniature tube socket, so if you did not want to use a 25L6 that may have been an option. I think that I would leave a cathode bypass capacitor connected, whilst true that it does boost the volume level it's real purpose it to reduce degeration of the stage. Besides that it's always nice to have a little headroom in an amplifier to widen the dynamic range. Most of the speakers were good up to whatever an AC/DC radio would put out, which is about 2-2-1/2 Watts.
Great video! I have a couple of 40's Radio-Phonograph Consoles in the "queue" for repair/refurb and have the same issue regarding cartridges for the turntable. Was just looking at adding a transistor based pre-amp module between the newer cartridge and the radio phono input, but this gives me some other ideas to play with.Thumbs up and subbed for more great ideas!
Yes, I have the same problem and thought of a Transistor Pre Amp. I think it would work just fine. I am thinking that you would have to filter the power supply really well to prevent any Hum.
Yes, transistor or even op-amp based pre-amp would work. Biggest issue is a clean enough power supply source for the radio. Low enough voltage and well filtered.
Have you seen Radio and Phonograph's video on how to rebuild old crystal crystal cartridges using brass sheets and ceramic chips?He used one from a 1941 Philco and he hooks it up and plays a record at the end of the video.The volume is quite loud.
I did exactly that on two units, the volume was good, it is not as powerful as if there were a preamp but it it certainly room-filling, albeit at close to max volume control setting.
I have made a ECC85(similar to 12AX7, double triode preamp and EL84 (6BQ5), and i wonder if i should put a negative feedback in the circuit to stabilise it and prevent crap audio or should i go without NFB? Thanks
Hi love ur video's I've built this same set an tried to do it just like yours But I'v wired somthing wrong the 6at6 I've got 69-70 volts on pin 7 plate but have no audio at all an pin 1 goes to the center lug of the vol. gives me minus voltage what voltage should i have the 25l6 has good volts on pin 3-4 any Idea????please helppppppp
Waaaaaaaay too much work. A transistor, rectifier/filter (sourced from the heater) resistor and two .47 caps and you have a dead quiet preamp in 20 minutes, without having to gut this thing. A bit more work (but less than adding another tube) is an op amp. You'll get a preamp and true bass and treble.
I'd MUCH rather have a TUBE driver than a cheap solid state device added. Just seems sac-religious, LOL! IF it was a solid state amp to begin with, then okay, but I'd rather keep a tube amp a true tube amp & have that nice warm sound!
13:50 Stevie Windwood and the Spencer Davis group! I love good test records we can enjoy!
16:40 I'll have to find that one. I only think of Humble Pie Rockin' the Philmore. (Philmore West music Hall I believe.... Not the Philmore stereo I have, 😆)
Your knowledge of these types of machines and electronics in general, is impressive. Very interesting.
Great video. Nice to know you don't have to stick with what you have. Don't know if I could make an amp like you did but you did a great job!!!
Another great video on yesteryear electronics. Keep them coming, some of us still need to learn how to repair them.
Good modification idea. Cheers! 🍻-Al
I love to watch you work ,you really good at what you do,and I love that you save as many radios and turn tables .I prefer the old stuff better ,a lot of the new stuff is a waste of money
Thanks. I would like to see you do a job from start to finish showing each step ( edited of course ) because you are good at explaining what you are doing to people who are beginners or intermediates.
Informative video, just what I needed to upgrade several crystal cartridge players I have. Thank you for posting this.
I need my sleep yet every minute was worth iy. I will digest everything and give you my comments. Thanks again sir. ❤️🇵🇭🆗🇺🇲🍻
A quick thank you for posting this video and schematic. I converted a single tube child's phonograph from 1950 and it sounds incredible. Great how to do it video Thanks again!
Hi Brian, Adding a speaker jack so that a bigger speaker can be added would be kewl. Don
Hello Don and Brian; I agree with an external speaker. Thinking about doing that to my RCA 2US7 with push pull 35C5 output. Love the Video. It shows me Brian has a Great Knowledge. WB5KSM 73
Very well done and explained. Thank you very much.
Bobby
Great project Bryan and well explained. Thanks......Carl
Great and informative video Byran!
That's a fantastic upgrade, might be worth it putting a better speaker in it now. Seems like this amp would work really well with the 0.9v P132D modern ceramic cartridges too, I just wish the connection pins weren't such junk on them.
I'm GLAD you posted this! It's gonna help me down the road when I get more back into repairing phonos again! I think it sounds WAY better keeping it a FULL TUBE amp, instead of adding a trans-sexual-sister and/or other solid state devices! Guess you COULD have gone one step further & added a 35W4 rectum-fire tube, too!
like all your videos.Hope to be able to try that preamp circuit with the many different old turntables I've aquired.Could use some ideas of what and where to buy some decent pickups to experiment with.
Excellent instructions, thanks for sharing :)
That chassis is rather interesting, it looks like three of the holes were punched to take a seven pin miniature tube socket, so if you did not want to use a 25L6 that may have been an option. I think that I would leave a cathode bypass capacitor connected, whilst true that it does boost the volume level it's real purpose it to reduce degeration of the stage. Besides that it's always nice to have a little headroom in an amplifier to widen the dynamic range. Most of the speakers were good up to whatever an AC/DC radio would put out, which is about 2-2-1/2 Watts.
Good video. It is a bit louder, however with that small speaker you will only get so much output.
Great video! I have a couple of 40's Radio-Phonograph Consoles in the "queue" for repair/refurb and have the same issue regarding cartridges for the turntable. Was just looking at adding a transistor based pre-amp module between the newer cartridge and the radio phono input, but this gives me some other ideas to play with.Thumbs up and subbed for more great ideas!
Yes, I have the same problem and thought of a Transistor Pre Amp. I think it would work just fine. I am thinking that you would have to filter the power supply really well to prevent any Hum.
Yes, transistor or even op-amp based pre-amp would work. Biggest issue is a clean enough power supply source for the radio. Low enough voltage and well filtered.
I like the look of the innards of the 6av 6s
Outstanding as always!
Have you seen Radio and Phonograph's video on how to rebuild old crystal crystal cartridges using brass sheets and ceramic chips?He used one from a 1941 Philco and he hooks it up and plays a record at the end of the video.The volume is quite loud.
Very nice job ! Sounds fantastic !!!! :-)
Thank you for the circuit ideas!!
Hi, did you include the center tap on the output transformer?
Very cool!
Did anyone ever try wiring replacement stereo cartridges in series for more output instead of wiring them in parallel as usual?
I did exactly that on two units, the volume was good, it is not as powerful as if there were a preamp but it it certainly room-filling, albeit at close to max volume control setting.
The new "high-end" kiddy record player!
I love the doors.
Such profession
Nice work!
what about the plate voltages? will the amplifiers work without a plate voltage?
Very nice, clever, but I would have built a one-transistor preamp on a lug strip.
What about using a Nuvistor tube as the pre-driver tube.
Q: how do you know it was a 3V cartridge and not a 1V or a 1.5V or a 2V cartridge ?
I have made a ECC85(similar to 12AX7, double triode preamp and EL84 (6BQ5), and i wonder if i should put a negative feedback in the circuit to stabilise it and prevent crap audio or should i go without NFB?
Thanks
+Slovenija12345
By crap audio i meant too high input signal ...
Hi love ur video's I've built this same set an tried to do it just like yours But I'v wired somthing wrong the 6at6 I've got 69-70 volts on pin 7 plate but have no audio at all an pin 1 goes to the center lug of the vol. gives me minus voltage what voltage should i have the 25l6 has good volts on pin 3-4 any Idea????please helppppppp
hello, maybe with that extra power you could have added a socket and switch for an external speaker, maybe period 8 or 10 inch.
i found a few 2.7 volt STEREO cartridges on ebay
Please post more new Videos
that sound good for a small amp rich bass
1:00 - Yeeeahhhhh!
13:17 - Similarly.
radiotvphononut has good taste in music here.
14:20 - Not so much.
I just noticed something your 6's look a little like a lowercase b. Hmm
Waaaaaaaay too much work. A transistor, rectifier/filter (sourced from the heater) resistor and two .47 caps and you have a dead quiet preamp in 20 minutes, without having to gut this thing. A bit more work (but less than adding another tube) is an op amp. You'll get a preamp and true bass and treble.
like that,, Good words..
If you say so...
I'd MUCH rather have a TUBE driver than a cheap solid state device added. Just seems sac-religious, LOL! IF it was a solid state amp to begin with, then okay, but I'd rather keep a tube amp a true tube amp & have that nice warm sound!
Muuuuccchhh better!!!!!
cant help myself--- milli-amp---ears