Seeburg SE100 Jukebox Restoration part 5 - Rebuilding the TSA9 Solid State Amplifier

[@gennaroliardo5724]

hi, congratulations for the video, I have a broken amplifier and original transistors are not available. Thanks to your video I can now rebuild the amplifier. Original amplifier are 25 + 25 watts, with rebuild how many watts? A piece of advice my speakers are completely broken, with a rebuilt amplifier can I connect 2 woofers 8ohm 50watt? thanks for everything

[@TheCrazzyToobinator]

Hello, if you want to do this amplifier rebuild be sure you understand how to properly measure and set bias current. Build a dimbulb current limiter for the initial testing, it is very easy to make mistakes and damage other components with these amplifiers if a wiring mistake is made. This mod will not provide greater output power because the power supply is only designed to handle what it was rated for begore. However the amplifier will be more robust and reliable with new modern transistors replacing the original Germanium ones that tend to fail with age. This is all the advice I can provide, the rest is up to you to figure out take your time and be safe!

[@gennaroliardo5724]

@@TheCrazzyToobinator ok thanks for the information. The germanium transistors I have found who sells them but they have a very high cost and very little guarantee of operation. I am thinking of buying an amplifier and modifying the original system, perhaps a faster solution

[@frattigiuseppe6697]

molto ben fatto e istruttivo

[@l42sz70]

Hey, thank you for the great and detailed Video! Will this modification also work 1:1 on the 230V 50Hz European Model of the amplifier? Thank you for your response in beforehand! :)

[@TheCrazzyToobinator]

If the amplifier has the exact same circuit layout and components then yes it should because the only difference is the primary voltage used. Always be careful though when performing this mod and use a current limiter(60-100wat incandecent light bulb in series with line voltage) when doing the initial testing. If you have a fault or the bias is set too high for the first time test you will blow the output transistors. I'm sure you already know this (as advised in the video) but always have to reinforce how important that is when modifying any amplifier circuit like this, easy mistake to make and transistors are pricey these days. I hope this helpful!

[@l42sz70]

@@TheCrazzyToobinator Hey, thank you for your response! I'll take a look at it and compare the schematics with the US Model, I'm thinking of restorating the Seeburg SE100 in the living room my mother got when she got 18, it still operates relatively good, but sometimes the carbon brush for the tonearm scrapes the side of the vinyl record while playing, I thought of recapping the whole amplifier because it sounds quite "muffled". So thanks for motivating people to dig out their jukeboxes and repair them!

[@TheCrazzyToobinator]

@@l42sz70 The sound on these jukeboxes is generally muffled compared to anything these days, they are not really "hifi". But couple things to check are make sure the needle is in good shape still and does not have dirt built up on it that the brush can not remove. Check the tone switches on the amp, bass could be up too high and treble could be to low. Lastly there are two mid range speakers up in the top section of the cabinet, they each have crossover caps which can dry out. If you do not hear sound coming out of these speakers make sure they are actually plugged in and making good connection inside the cabinet. Just some more things to check have fun!

[@sidn276]

thanks for the video, I have a S100 with the original SAM1 amp. Anyone familiar with upgrading to the TSA5? I'm assuming that this TSA9 won't be compatible

[@TheCrazzyToobinator]

The SAM1 amplifier looks like it maybe mono and the TSA5 is stereo, if the cartridge on the S100 is a mono cartridge then it is likely not possible to use a TSA5 or TSA9 without a lot of modification.

[@sidn276]

Thanks for the quick response, I will check into it@@TheCrazzyToobinator