Congrats!

Thank you for the this video, my amp’s tube chart had the circuit obscured as the ink had worn off. But I can clearly see my 1969 Bassman Export is an AC568, the rectangle 7w resistors are the dead giveaway!

Thank you!!!

I have the same setup as you. its the best ever.

The days of NO Electrial codes. There was a lot off dangerous practices in those days. Like people shoving a penny into their home fuses which were the treaded circular, glass dome type.

What size of cab is that

Thanks for doing this!!!

Well done my friend! You are fabulous. I think you would get more views if you're audio improved...not you! The audio. Thanks again and Merry Christmas

Great lesson. Thx

AC568 is made in santa ana ,, the Ac568 ones will all say made in santa ana

Great show. I,m down there somewhere.

21:10 on the bias electrolytic capacitor. positive goes to ground. negative goes to bias circuit. bias is a negative voltage. to work correctly, ground is a more positive voltage than the bias circuit. (positive lead goes through the board to be soldered to the chasis)

The ‘68 silverface drip-edge Bassman is easily the most toneful amp I’ve ever played. It has a sweet, JTM45-like overdrive as well. I use Sylvania str-387 6L6GC’s. Those tubes transform the amp.

Mine is a bassman 135 ? What does this mean ?

Thanks, saved me some time!

Great video! Very informative. Helped me solve my problem. Can you provide a link where I may source one of those recap kits please? One or two of my 500V caps have spewed their guts. The amp still works though, but I've gotta get those caps and the 10K and 4.7K resistors that are out of spec around it replaced.

I do not understand what you did with the neutral wire and the heat shrink. You just soldered it to one of the transformer taps and didnt connect it to any of the switches or the fuse? That doesnt seen right. Please help lol I am driving into my drip edge bassman

The AA864 is the best Bassman circuit.

My tweed limited edition w/ celestion shows up this week 👍

Just did the mod on an old brown fender deluxe....El Perfecto!!!

My favorite is the pro reverb. It's technically a 65 bassman circuit but 40 watt, tube rectifier, reverb and trem. An amp expert said it was a AB 763. So I'm confused. It sure don't have tge scooped out mid range. I think it fatter sounding.

I have a 68 bassman it's all I use.

Duane Allman Filmore East played a 1968 Bassman. Huge score for you man🎸👍

Really enjoyed this lesson and the way you explain the song it's nice and easy to understand keep it up

The 2 resistors on the 6.3v lines are a virtual center tap. The AB165 transformer has an actual center tap. Other than this I would argue the changes to the AC568 circuit are all improvements. This runs counter to popular opinion that BF's are better than SF's.

The AC power supply cords being used to update these old amps have the ground wired to the amp chassis. The outlet on these old Fender amps have a slot for polarized plugs. There are a lot of electrical things in a home that only have 2 prong plugs. Some things like tools are double insulated that do not require 3 prong. The outlet could be used to power a small computer fan to cool the inside of the amp or a recording device etc. Not everything has or needs a grounded plug. If you plug a 2 prong lamp into a 3 prong outlet the lamp isn’t grounded. What’s wrong with retaining the courtesy outlet?

i hope you got the 3 prong cord fixed...people have died from vintage cords no joke

That clean sound is amazing. Does it start to break up at 4? I have a strat with humbuckers and I'm curious how loud you can get it while staying clean and still loud enough to be heard over drums

I have just got one too and I am in love!!

What a good lesson!

If you see my message please help me is it worth a couple of thousand because there antique

I don't have the aluminum trim on mine

The 4 small glass tube on yours is not the same as mine because mine is aluminum tube not glass

Is there a serial number on the top mount to let me know the year

I have one also how are they worth if i was gonna sell it

I just recently bought a late 60s Bassman. It was advertised as a 67 bassman and the tube chart inside indicates the AB165 circuit. But when I checked the serial numbers and dates on the chassis and transformers and checked the actual circuitry it was clearly put together in early 1969. And it has the AC568 circuit in spite of what the tube chart says. I read on a site that this often happened; that they used up the old AB165 paper tube charts because the order of the tubes didn’t change even though the circuitry did. Anyway, I had the amp checked out by my favourite amp tech. He switched to a 3 wire ground power cord and replaced just one of the filer capacitors. I also asked him to use the disconnected ground switch to make a switch to turn the Negative Feedback loop off and on. WOW, when the feedback loop is switched off the amp growls almost like a Marshall. With it switched on the amp still sounds great and even better when I jumper cable the bass channel to the input of the normal channel. I’m hoping some day I will be able to compare the sound of my amp to Blackface Bassman with the AB165 circuit to see if there is really much different. I am very happy with the sound of this amp.

It would be helpful to provide the link to where you got your recap hit here. You go through that part rather quickly in the video.

One just like this for sale in St George UT at music store 1968 fair condition. Sounded good with a bass needs new speakers I'd say. It is just so hard to resist at $1000.00. Big and heavy. WOW I just love these old Fenders.

Thanks! going to attempt this on my 1963 bassman. It doesnt have a curtesy switch but it does have the ground switch. Im getting tired of getting shocked all the time and im pretty sure its mudding up my sound since modern day outlets have more voltage since 1963.

Real nice

Great sounding amp! It has that smooth, buttery tone.

What type of blues progression is this? (ie, I iV V) its the same as im gonna find another you

13:14

I replaced the stock Jenson speaker with a Celestion Redback G12H 150w 8ohm in my Fender Deluxe Reverb ‘65 re-issue. Big improvement.

Very helpful information. Thank you!

Classic sound, and that reverb is great. Good choice, matches your playing style well.

Great lesson, Love U2! Can I post this on my Facebook music page All Music?

Hi great vid! I am trying to make this mod with my 1959 tweed bassman. It's completely original so all the wiring is stock. My amp is wired slightly different than yours. Our black and white wires go in opposite directions it seems but accomplish the same result. Firstly no courtesy outlet for me so the hot and neutral leads go straight to the ground switch. From there my black lead (I'm assuming its the hot lead, please correct me if I'm wrong, but I checked the layout so it should be right) goes straight to the fuse holder via a jumper through the fuse it goes to the power transformer (PT). My white cable (neutral I believe) goes from the other leg of the ground to the on/off switch. There's a jumper on the other end of the on/off going to the PT, I'm assuming that's coming from the black lead. I aim to bypass the ground switch entirely as you have done, the new hot lead going straight to the fuse holder, and white going straight to on/off and green to chassis. My death cap is wired from the ground switch to the chassis but If the ground switch has been removed from the equation, why is it still necessary to remove the death cap? Long text for short question. Thanks for your time! And removing that strain relief was a huge pain in the arse without the special tool!

good lord that is a sweet sounding bassman.. what a match with the LP..

I used to have one just like that. I still have the cabinet .I let someone borrow the head ,and it was "stolen ".That guy had lots of bad luck. His car caught fire the week after that.