1972 BASSMAN 100

[salazarich]

HELLO people i made a video of this project and let me know your thoughts. i did some mods since the video. An experienced person went throught thre extra effort since the video. \\richard 562-3384419,

[salazarich]

the master volume circuit was put to the fender pre cbs circuit style.\the power tubes were replaced. \the bias is wired to pre cbs specs, the filter caps were replaced and capacitanced brought up, with metal caps. \richard 5623384419

[Stevem]

Your talk of a pre cbs master volume set is way wrong as Fender was sold to cbs in 1965 and the first master volume on a fender amp came about in the 1970s!

[Davidg]

Are u auditioning for a role as TAG announcer? Do u realize u just posted 3;30 of u talking and that is 3;30 of my life I will never get back

[salazarich]

Hey I don't understand your comments steve. This particular amp is a 1972 bassmann 100. Here is a bit of information. In 1965 or there abouts in time Leo fender sold fender musical instruments to CBS. CBS had ideas about how the amps should be designed. CBS implented a self adjusting bias. I do not like this. CBS added a master volume so club owners can turn down musicians. I do like this. They also added an extra capasitor on each side of the push pull power output tubes. I dont like this. In 1972 there ideas about were well established. I do not like their designs or sound. I also know some of the out put transformers were underpowered in the CBS era. One amp might be advertise to be 100 watts but in fact that particular amp may be as low as 60 watts in power. I was lucky that this output trans is strong at 85 watts. The amp is not 100 but a hard strong 85 watts. I will post a video of how the amps sounds now.
The modification that was performed at present time. Leo fender pre CBS bias supply circuit 1965 era, master volume cicuit removed although the knob is still there it is not wired, the pre amp circuit is Leo fender mid sixties style with a lot more gain. More to come. Next job is installing a better output transformer with a power rating 100 to 120 watts. I will not install the new transformer untill the original one burns. thanks Richard Salazar 5623384419

[roadkingbluzs]

I think this thread should be in the FENDER Discussion section. Can it be relocated? Sometimes a good clear photo (well lit) of before and after mods will suffice, with details. The vid is to dark and , well... and some of your methods of making changes are not what I would do. I usually try to bring back amp to optimum original specs before beginning any mods/ tweaks. As for replacing the xfmr you maybe in for a long haul. Very good iron IMO.
Just my 3 cents. Good luck

[vibratoking]

Actually, this thread would be better off placed in a black hole...can't it moved there?

[Davidg]

I second the motion for sending to a black hole. Do I hear a third?

[Leo_Gnardo]

Some days I'm very happy I have no way to download videos. Today is one of those days.

This particular amp is a 1972 bassmann 100. Here is a bit of information. In 1965 or there abouts in time Leo fender sold fender musical instruments to CBS.

AFAIK the contract was signed 5 JAN 1965

CBS had ideas about how the amps should be designed.

A half ass attempt to make them more "hi fi." Didn't go over well with musicians.

CBS implented a self adjusting bias. I do not like this.

No self bias in any amp bigger than a Champ and the CBS geniuses left the Champ and VibroChamp alone. From Princeton on up, "fixed bias" which in many cases is adjustable. Before AND after the CBS takeover.

In some amps, Bassman and Super Reverb most notably, CBS tried a combination self bias and fixed bias. Worked like crap and sounded that way too. Easy to modify to fixed. Takes maybe 15 minutes. If you're slow.

CBS added a master volume so club owners can turn down musicians. I do like this.

Just about anybody who attempts to fiddle with a muso's amp settings will end up with a guitar-shaped lump on their skull, then and now.

Master Volume was added in another half ass attempt to let musicians dial up their amp for distortion. After having modified the circuit to minimize distortion. Go figure. Worked OK in Marshalls, not so much in Fenders. Sounds awful, not awesome.

They also added an extra capasitor on each side of the push pull power output tubes. I dont like this. In 1972 there ideas about were well established.

Extra cap on each side of the master volume, yes they did that.

Extra bias cap for more filtering in many larger amps, did that too, not much harm there.

Extra 0.002 cap from output tube grid to ground. Rolls off high frequencies. You can clip 'em out in less time than it took to type this sentence if you don't like 'em. Then put 'em back if your ears decide you made a mistake. All a matter of taste.

I do not like their designs or sound.

I do not like green eggs and ham.

I also know some of the out put transformers were underpowered in the CBS era. One amp might be advertise to be 100 watts but in fact that particular amp may be as low as 60 watts in power. I was lucky that this output trans is strong at 85 watts. The amp is not 100 but a hard strong 85 watts.

Specsmanship. How many watts, at what distortion level. An amp measured at clip will measure a lot more at 5 or 10 or 20 or more % distortion. You can add 12% to the power figure for every 5% additional distortion. A 65W amp becomes a 100W amp measured at clip, then at 20% distortion, making NO changes in circuitry or transformers. Nothing new here, NEXT...

I will post a video of how the amps sounds now.

Pleeeeeeze, spare us.

The modification that was performed at present time. Leo fender pre CBS bias supply circuit 1965 era, master volume cicuit removed although the knob is still there it is not wired, the pre amp circuit is Leo fender mid sixties style with a lot more gain.

Do you NEED a lot more gain? Guitar, maybe. Bass, no thank you.

More to come. Next job is installing a better output transformer with a power rating 100 to 120 watts. I will not install the new transformer untill the original one burns. thanks Richard Salazar 5623384419

Waste your money any way you want. Only so much power is available from the power supply. You can put in a 500W rated OT and the power supply will still poop out at 85W. Output transformers DO NOT manufacture power. Just a gearbox, like a car transmission that's all. Unless you put in a bigger engine (power supply) you'll top out at the same mark. How frustrating.

Get a hold of Gerald Weber, you could teach him a lot. About B.S.

We're not impressed. Neither are our friends. And we have some high ranking friends, some good looking smart and talented ones too.

[JazzGuitarGimp]

Thanks for the laugh, Leo - I needed that!

[Leo_Gnardo]

Thanks for the laugh, Leo - I needed that!

I learned from Col. Hackworth, you gotta out-G the G. In this case out-C the C, C for clown. Big red nose and all. Go ahead, squeeze the weeze. See I'm a bozo, doesn't hurt a bit. At least I know it. Hey let's go to the funway, maybe we can beat up some toasters or sumpin'.

When the BS is running deep, bamboozle 'em with facts. Lost a couple jobs that way... clowns don't like it. Too bad, let 'em stew. They never prosper.

Thank YOU JGG!

[Phil_S]

\\richard 562-3384419,

I think Richard wants us to call him up on the phone!
While you have him on the line, ask about his hot rod trucks! Google that phone # and this is what you get! http://www.jalopyjournal.com/forum/thre ... od.865870/

[Reeltarded]

And this is why my folks named me after three other people woohoo

#googleproof

[vibratoking]

Wait a minute, this guy hasn't reached epic proportions yet. Not at all like Burgess, yet.

[salazarich]

I am sorry for posting my this thread. I do not have a truck. And CBS circuits are terrible. I just wanted to share what was happening to my amp. If one have any thoughts feel free to talk about it, if it not constructive keep it to one self. Thank you kindly.Richard salazar