just followed this for a Silverface Bassman Ten and the mod worked great. thank you for sharing !

Do you have a parts list of what caps you replaced?

Great Video. I am restoring my Wurlitzer 2600 Juke Box as I type this message. I am getting heavy distortion coming out of the speakers. Do you think this could also be the capacitors? Also, can you tell me if the Cap Cans are plug and play? It looks like I need to Solder these in.

T-3 was the stamp I used when I worked at Fender. I was probably the tech that originally tested and passed that amp!

Use an anolog meter for alignment.

mine is going into the recycle bin. Time to update. I’ve gotten my moneys worth. Not worth trying to repair.

I remember when you could buy as many of those as would fill an airplane hangar for $125. each.

At 10:10 you didn't mention the OSC. below the 12BE6 that gets mixed in the with that tube. --- Also see: *Jim Burns* where he tares them down to the bare metal!

Design dept finished designing small radio... Production: ..and where do we put the speaker? Design dept: ..oh just lobb it somewhere in the back...

You seem to tap and slap a lot in there. Its hard for me to look at.

Parabéns um ótimo trabalho …

This may be my favourite

the tube radios were always the best

I use to enjoy listening to am radio late night i could tune into stations hundreds of miles away

Great video! Using the 50L6 instead of the 35L6 is a good upgrade. The AC line voltages today run higher than the 117V used in many places up till the 1960s. So the 50L6 will keep the current draw through the series filament string lower and will help to prolong the life of the tubes. Anyway, this is an Awesome looking radio! I never seen one with the chassis mounted vertical before.

Oh I love that!! I sure wish i could afford you to fix my Grundig 1088. Great video!! I'm terrified of capacitors and have no way to test tubes.

The 8mF filter cap indicates that this is an AA165 and not an AA864. I have an identical one made in the 9th week of 1965. Great video

Very unusual looking radio. Reminds me of a ships radio.

I'm about to start working on an old comet aswell and I was wondering what voltage the capacitor you used to replace the old one was I appreciate any help in advance

Seems like there was some hum. Did you address that?

I just bought one!

I was under the impression that the 864 didnt have the 27k dropping resistor and extra filter cap...

You could tell that it was a 1965 or 64 by the faceplate that referred to the Fender Electric Instrument Company. That makes it pre-CBS. It is in astonishingly good condition. I own a 1964 Super Reverb myself, but I have played through many Bassmans. They're really great amps!

Nice channel. I probably restore 4-6 of those annually and I've never seen those blue filter caps before. I'm usually treated to those sweet gold GE caps on occasion. What a find! Happy holidays!

True 5881 tubes are 23 watts. Those are likely 6L6GCs posing as 5881 and would be 30 watts.

Thanks for the video. I just received my bassman 10 today...and was trying to figure out what year it was made and more. I noticed that mine is also made by a worker named Castillo....same black rubber stamping too. Though, mine appears to be L. Catillo not J. Castillo. Also, since yours had a date stamp inside....I figured mine did too. So started to search for that too...and sure enough...mine is May 21st of 1973. Glad you showed all that stuff so I could figure out mine. The Fender rep thought mine was from 76 since it had a 5 digit serial number...but, he was wrong. Was this bassman from a combo or just a head unit? Both have the word ''Head'' on the back in the same rubber stamp as Castillo....so, trying to figure that out too. Thanks again for the video!!

Hi, I made the change but I find -51 volts on the end of the 220kohm resistor which then goes to pin1 of the final valve, while on the other end of the 220kohm resistor a negative voltage of -40 volts. why is there this voltage difference? Could you give me a suggestion regarding this??? I would thank you very much. I am going crazy!!

Great video. I have a '73 Pro Reverb with the same amount of 25uf 25 volt caps in the same position (most other Pro Reverbs have 7 on the board). One of them is a 5uf 50 volt. I've had to change them all along with the filter caps but am struggling to find a 5uf 50 volt cap so replacing it with a 25uf 50 volt cap. Mine needed changing, but if it aint broke, don't fix it

Sorry ph don't the volume out of here.

What book are you referencing for thr bias layout diagram ??

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Your amp came with that standard bias from the factory.

Sounds fantastic!

Good on you! I have a '77 in a MojoTone cab and a BF OT. Thing sounds killer. Wooh! That Celestion should should real fine in there!

Nice radio

God bless you repair guys who have to deal with this design nightmare. I have an original ('94, I think) Blues Deluxe which I bought brand new. I was SO disappointed when I first took the off the back panel to discover there was a computer instead of an amplifier! Had to have some of the rattly, noisey little pots replaced, but the thing has been like a tank, I have to admit; and sounds FABULOUS! But like you said ... LOUD! BTW: I took it apart and shellacked and lacquered the tweed, many years ago. Looking pretty good.

Dear Sir. Having just found your video chanel I have subscribed. Very enjoyable content. Many thanks for sharing.

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I guess that youtube algorithm really wants to encourage me to try and repair a dead Polysix my friend brought me recently, pfff thanks a lot for this video! It's inspiring as hell wish I could just bring this dead boy to someone like you instead but I can't really think of any reliable repair technicians around in my area

Typically, silverface Deluxe Reverbs are only about 7 or 8 component values different from the blackface versions, And so converting them to black face specs is actually pretty easy, but the silver face ones have more gain and so you might not want to change all the components back to the blackface circuit. The one change I always recommend is that there is a coupling capacitor (just before the phase inverter if I remember correctly) in the SF amps that is literally 10 times the value of the same locatiin capacitor in the black face circuit. Because of this the silver face amps have way way too much bottom end, enough to make your pants leg flap, and so blown speakers is a common problem. Reducing that coupling to the blackface value gives the amp more clean headroom and the speakers will last longer. The heavily waxed boards tend to absorb and hold moisture from the air, contrary to what CBS-era Fender thought they were achieving when they applied the wax. If the board is microphonic, or you have scratchy controls that never seem to clean up completely, it's because there's DC voltage on them, due to the board having become *conductive* from trapped moisture and remnants of old flux. You can actually measure high voltage leaking through the board, an inch or two away from the plate resistor connections; the DC leaks into the grid circuit, causing hum and spurious noise and sometimes premature failure of preamp and driver tubes. Watch some Psionic Audio videos to learn how to remove excess wax and flux with alcohol and a hair dryer or heat gun. Granted, this might not be as much of a problem if you're in a relativdly dry part of Canada; but the last time I was in Montreal the humidity rivaled what you'd experience in the Southern USA. PS, At least one of those filter caps was indeed made in 1973, several years before the amp was built. They're ancient, and if you leave them in there, they area a catastrophic failure waiting to happen. A shorted filter cap could blow your power transformer. It's best to change them.

I've got a 1974 deluxe reverb, all the caps have been changed, all the tubes are rca. I love this amp, it has an amazing sound.I think I may have over payed for it at $2000. but it is in almost new condition.

Thank's

What book, reference are you using?

Did you have any methods for improving the fit inside the chassis?

Order the correct CAPs! Your values are to low, and will have some amount of noise!

Didn't Weber include instructions for this kit? Also, I don't care for the stainless steel chassis material... too many reflections. Enjoying the series.

Great presentation. Subscribed.

Intresting Video. If I understand it correctly, you are replacing the bias balance control by a bias level control. I have an 1979 Silverface Twin Reverb 135W (UL). I would like to ad a bias level control by keeping the bias balance controle. There is a very short video on you tube where a respectable amp tech replace the resistor on the pot by an resistor (6,8K) and a trimmer (10K) in serie. That way, once again if I understand it correctly you can keep both controls: the balance by the pot and the level by the trimmer. What do you think of this modification? Looking forward to see your opinion. Best Regards. William

I have a Fender Twin Reverb. It is a 1978 model that had the bias balance circuit. Whoever owned it before me modified the balance circuit to be a bias adjustment. The mod seems to have been done in much the same way you did yours. However, the two 47K resistors that couple the phase inverter (V6) to the .1 uf coupling caps have been changed. They are currently a 68K and an 82K. The resistors on the other side of those coupling caps are 220K just like you installed in yours. So each side will adjust the negative voltage on a pair of the output tubes. I'm a little confused because my bias pot is wired similarly but not the same as yours, and those front side coupling resistors have been changed as well as the ones on the other side of those .1 uf caps. I guess the good news is, I can adjust the bias, so I suppose I should just leave well enough alone.

We’ll done. I wonder if anyone is making replacement couplets for old radios??