Youtube AA165 Bassman????

[ToneMerc]

Ran across this on Youtube, who needs a Marshall. I actually think is a transitional 6G6B circuit and not a AA165 w/pres. Kind of hard to believe this is the normal channel and not the cascaded bass channel though.

http://m.youtube.com/watch?v=xTfwHtgWQX ... TfwHtgWQXo

TM[/code]

[Structo]

That sounds great!

No boost pedal at input at all?

[Blackburn]

That's one rude Bassman! I'm also curious about what's going on under the hood. This clip rips too.

http://www.youtube.com/watch?v=_N8wNmi9B40

I really want one of these amps!

[dcribbs1412]

Both clips sound good
really need to get serious about a bassman build...
TM after hearing that clip and seeing your builds I think I' moving in the 6G6B direction. Did you get the brown faceplate or have it made?

Darin

[Timvox1]

Ran across this on Youtube, who needs a Marshall. I actually think is a transitional 6G6B circuit and not a AA165 w/pres. Kind of hard to believe this is the normal channel and not the cascaded bass channel though.

http://m.youtube.com/watch?v=xTfwHtgWQX ... TfwHtgWQXo

TM[/code]

It's not an AA165 amp.
It might have the AA165 tube chart but the AA165 didn't have a presence control.
The 6G6-B was the last Bassman with a presence control - after that they went with bright switches.
I recently changed my 1967 AB165 Bassman to a 6G6-B circuit and it sound very much like the amp on the You Tube video.
The other great thing about this amp is not only does it sound great cranked but it has one of the best clean sounds out of any Fender with the volume set at 3 or below - I Love mine now!

[ToneMerc]

Both clips sound good
really need to get serious about a bassman build...
TM after hearing that clip and seeing your builds I think I' moving in the 6G6B direction. Did you get the brown faceplate or have it made?

Darin

Darin, I built those when Marsh was selling the brown repro faceplates They are mean just the one in the link, except I modded the bass chan.

I will say it again, the 6G6B is the sleeper Fender circuit and to think Fender engineering marked the design as unstable.

TM

[JazzGuitarGimp]

Is the Bass Channel or the Normal Channel being used here?

Thanks,
Lou

[Timvox1]

Both clips sound good
really need to get serious about a bassman build...
TM after hearing that clip and seeing your builds I think I' moving in the 6G6B direction. Did you get the brown faceplate or have it made?

Darin

Darin, I built those when Marsh was selling the brown repro faceplates They are mean just the one in the link, except I modded the bass chan.

I will say it again, the 6G6B is the sleeper Fender circuit and to think Fender engineering marked the design as unstable.

TM

You are so right.
I've been using Fender amps for 40 years and until recently I was unaware of how great the 6G6-B Bassman was.
I got the mod kit from Marsh to change my 67 Bassman amp to the 6G6-B.
It's one of if not the best amp I've ever owned.

[Firestorm]

Sure would like to see the inside of the first one (heck, second one, too). On the first, it says it's in a later BF cab, but the faceplate looks BF, too. I don't think those exist: Fender usually ran through all the existing cabs, chassis's and faceplate before the official introduction of a model (even if the guts were new model, the cosmetics were old). A BF 6G6-B would be an anomaly. But nothing they did would surprise me.

Agree wholeheartedly on the tone value of the 6G6-B; take away some of the attenuation on the Bass Channel and they would have nearly invented Trainwrecks. O heresy!

[JazzGuitarGimp]

Based on what I am reading here, it looks like the bass channel is the more desirable channel for guitar, yes? And is this with stock component values per the original Fender schematic, or has there been some tweaking of the components?

[ToneMerc]

I don't think those exist: Fender usually ran through all the existing cabs, chassis's and faceplate before the official introduction of a model (even if the guts were new model, the cosmetics were old). A BF 6G6-B would be an anomaly. But nothing they did would surprise me.

The BF 6G6B does exist, it was called the tuxedo Bassman because it had he black faceplate and the leftover blonde era white knobs. I imagine when they ran out of white knobs, a few shipped with the new style knobs. TAG member Toppscore has one in his collection. Here's a link to pics of a tux Bassman.

http://s118.photobucket.com/user/steveo ... t=3&page=1

TM

[ToneMerc]

Based on what I am reading here, it looks like the bass channel is the more desirable channel for guitar, yes? And is this with stock component values per the original Fender schematic, or has there been some tweaking of the components?

Lou, hard to say what's under that one. Having built several I find it hard to believe though that what I hear is coming from he stock normal channel. However, it's on a load box so some of that may be power tube distortion. Nevertheless, the ones I built sound like that or better on the bass channel with the volume set at only on 4. The bass channel has 4 gain stages.

https://tubeamparchive.com/download/file.php?id=25202


TM

[cbass]

Does the CF count as a gain stage?

[JazzGuitarGimp]

Thanks, TM.

Yes, I see there are four triodes in the bass channel vs two in the normal channel, though the second stage in the bass channel is configured as a unity-gain buffer to drive the tone stack. I was more curious about which tone stack we're hearing, as they are totally different between the two channels. I am really intrigued by the tone stack in the normal channel. So much so, that I have a few of the 350K w/ 70K tap pots on order - I am going to try this stack in the clean channel of my upcoming build. I have a feeling that, for a clean channel, the stack in normal channel will sound fantastic. I am hoping the end result justifies my hunch.

CHeers,
Lou

[ToneMerc]

Thanks, TM.

Yes, I see there are four triodes in the bass channel vs two in the normal channel, though the second stage in the bass channel is configured as a unity-gain buffer to drive the tone stack. I was more curious about which tone stack we're hearing, as they are totally different between the two channels. I am really intrigued by the tone stack in the normal channel. So much so, that I have a few of the 350K w/ 70K tap pots on order - I am going to try this stack in the clean channel of my upcoming build. I have a feeling that, for a clean channel, the stack in normal channel will sound fantastic. I am hoping the end result justifies my hunch.

CHeers,
Lou

Lou, its only 3 stages as that bass 2nd is only a current amplifier right?. Lou, yes the normal channel is great. Unfortunately, the taps of the modern 350/70 pots are not even close and the taper is slightly slower as well, but are better than other methods. I compared them to vintage CTS 350/70 pulls that I have.

TM