A year ago I had no intention whatsoever to try to fix my old amps and radios, "fortunately" the local local electronics repairshop wasn't too keen on it either and so I reluctantly ( too many charlatans around ) took to the internet to try to understand the maze inside an amp. By watching Blueglow, Electronics old an new and D-lab I picked up enough to bring life back to one of my radios, so satisfying. Watching these tutorials are now allmost obsessive and there can't be too many step-by-step ones, so thank you so much for guiding me. Good to hear you got off the treadmill. Greetings from a tinkering swede.
Thanks for this, I wasn't aware of D-Lab ruclips.net/user/dlab500 I also get good info and amusement from Glasslinger, Big Clive, Mike's Electric Stuff, and Mr Carlson's Lab -- tho Clive and Mike are mostly not tube stuff.
Good advice to inspect before powering up. Another thing to look for is caps (eg. black beauties) that are outright *missing* or not where they are supposed to be. I opened up an AA5 radio recently where the black beauty "death cap" had outright exploded into pieces. The fragments were all in the chassis (on an open chassis they might be missing), leaving just the 2 end wires hanging in mid air. Noting that the cap is outright gone and then dressing the leads to remove possible shorting problems should be done prior to initial power up. Cheers,
Love your video as always. Just a thought, folks should probably make sure caps are discharged before poking around. Never know if they are holding a charge. Thx and looking forward to the next one!
Great tip on the carbon resistors. I'll have to add that to my review. When it comes time to check (and replace if necessary) out of spec carbon comp resistors you could discuss any issues with replacing with metal film resistors (assuming wattage is the same or greater than the original).
Thanks so much for doing this series. I have about 6 or 8 vintage radios and record players that I want to get working again. If you have not covered it in the videos, where do you like to buy caps, resistors, tubes, etc. Any recommendations will be appreciated. Thanks again.
I need to know how to safely connect my oscilloscopes arbitrary waveform generator to input of amp when observing out put with oscilloscope. They have common ground as they are inside the same unit. It is a DSO. I don’t want to screw up. Is it safe to connect without isolator?
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Great videos! One add on for the initial check: pull the tubes and make sure the alignment key in the base is intact.
A year ago I had no intention whatsoever to try to fix my old amps and radios, "fortunately" the local local electronics repairshop wasn't too keen on it either and so I reluctantly ( too many charlatans around ) took to the internet to try to understand the maze inside an amp.
By watching Blueglow, Electronics old an new and D-lab I picked up enough to bring life back to one of my radios, so satisfying. Watching these tutorials are now allmost obsessive and there can't be too many step-by-step ones, so thank you so much for guiding me.
Good to hear you got off the treadmill.
Greetings from a tinkering swede.
Thanks for this, I wasn't aware of D-Lab ruclips.net/user/dlab500
I also get good info and amusement from Glasslinger, Big Clive, Mike's Electric Stuff, and Mr Carlson's Lab -- tho Clive and Mike are mostly not tube stuff.
The magnet trays are a great idea.
What a great little amplifier. The condition is amazing.
Looking forward to the next video. Thank you!
Nice vid, Mark! Before powering up I'd check the coupling caps and carbon-comp resitors too..
Good advice to inspect before powering up.
Another thing to look for is caps (eg. black beauties) that are outright *missing* or not where they are supposed to be. I opened up an AA5 radio recently where the black beauty "death cap" had outright exploded into pieces. The fragments were all in the chassis (on an open chassis they might be missing), leaving just the 2 end wires hanging in mid air. Noting that the cap is outright gone and then dressing the leads to remove possible shorting problems should be done prior to initial power up.
Cheers,
Love your video as always. Just a thought, folks should probably make sure caps are discharged before poking around. Never know if they are holding a charge. Thx and looking forward to the next one!
Great tip on the carbon resistors. I'll have to add that to my review. When it comes time to check (and replace if necessary) out of spec carbon comp resistors you could discuss any issues with replacing with metal film resistors (assuming wattage is the same or greater than the original).
Thanks for your time Mark...
Awesome. Thanks for letting us peer over your shoulder!
Im looking forward to this series as well. learning something new all the time.
Thanks so much for doing this series. I have about 6 or 8 vintage radios and record players that I want to get working again. If you have not covered it in the videos, where do you like to buy caps, resistors, tubes, etc. Any recommendations will be appreciated. Thanks again.
Really looking forward to this series-thanks, Mark!
Great to see these videos. I need to watch part 2 next.
I'm curious if Mark is going to replace the power chord with a polarized plug.
This is gold - thank you
I'm following . This is great.
helpful and informative, thanks
I enjoyed that that, it was very interesting and informative.
nice looking little amp
Great stuff!
Hello Mark, i hope you feel better. Great idea this troubleshooting series (tube and solid state) ! Thx
Ps what about the pre amp ? :)
thanks
your intro kicks ASS!
I need to know how to safely connect my oscilloscopes arbitrary waveform generator to input of amp when observing out put with oscilloscope. They have common ground as they are inside the same unit. It is a DSO. I don’t want to screw up. Is it safe to connect without isolator?
Is the octal socket between the power cord and fuse for an input voltage selection plug?
Nice!! Like it!! :-)
true rats nest construction