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Post subject: Re: 68-69 drip edge Bassman /circuit changes
Posted: Fri Apr 24, 2015 8:31 am
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As you can see I had to move my rig to the basement and share half of my workshop with my Guitar gear
The man cave / Studio is under construction and will be for months :roll:
But I'm thankful, all we've been through with our crushing blow to the local economy and other factors were Blessed to have a place to live !
Image

I found a few 022871 OT's on E-bay but I can't convince myself at this moment that its worth the $$$ or effort to replace the Fender OT thats in there.

Bottom cab has an Eminence Governor and the top has a Swamp Thang

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Keepn' the Blues Alive

2004 50th Ann. Limited edition AMSE Stratocaster
2017 50's Baja Telecaster BSB

1968 Bandmaster with 2X12 cab C-rex speakers
VHT Special 6 Ultra combo

Visual Sound Route 66
Cmatmods Signa Drive


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Post subject: Re: 68-69 drip edge Bassman /circuit changes
Posted: Fri Apr 24, 2015 5:54 pm
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Chris,

Nice Man Cave. Need some "babe posters" to decorate the walls. :lol:

I'd love to restore a tweed era Bassman. Maybe, not the the Holy Narrow Panel... but an earlier Wide Panel. One day...


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Post subject: Re: 68-69 drip edge Bassman /circuit changes
Posted: Fri Apr 24, 2015 6:25 pm
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Not gonna happen Steve (the posters)
Married to a little red headed chick that isn't gonna put up with that LOL !
Looking forward to the cap job, This amp sounds too sweet, can't imagine it getting better
Slight hum at low volume and pimples on the caps so..........
46 to 47 year old caps

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Keepn' the Blues Alive

2004 50th Ann. Limited edition AMSE Stratocaster
2017 50's Baja Telecaster BSB

1968 Bandmaster with 2X12 cab C-rex speakers
VHT Special 6 Ultra combo

Visual Sound Route 66
Cmatmods Signa Drive


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Post subject: Re: 68-69 drip edge Bassman /circuit changes
Posted: Sat Apr 25, 2015 7:36 pm
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Here is the recent 69 Bassman
soundclip
Modded bass channel and the normal channel

https://app.box.com/s/ebpyghrn4tm9r16npdsodnvhuv0upa07

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Keepn' the Blues Alive

2004 50th Ann. Limited edition AMSE Stratocaster
2017 50's Baja Telecaster BSB

1968 Bandmaster with 2X12 cab C-rex speakers
VHT Special 6 Ultra combo

Visual Sound Route 66
Cmatmods Signa Drive


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Profile
Post subject: Re: 68-69 drip edge Bassman /circuit changes
Posted: Sun Apr 26, 2015 8:15 am
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Filter caps are on order !
They were out of 16uf 475 so I ordered an extra 22uf 500V far that last stage
Steve I did go ahead and get the 100uf 450 volt for the first stage
I hope to photograph this procedure in great detail for future Bassman Tweakers
First thing ya need is one of these to drain off the voltage in the caps to keep from being injured :shock:
Image

_________________
Keepn' the Blues Alive

2004 50th Ann. Limited edition AMSE Stratocaster
2017 50's Baja Telecaster BSB

1968 Bandmaster with 2X12 cab C-rex speakers
VHT Special 6 Ultra combo

Visual Sound Route 66
Cmatmods Signa Drive


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Profile
Post subject: Re: 68-69 drip edge Bassman /circuit changes
Posted: Sun Apr 26, 2015 10:23 am
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Here is my new 69 bassman
Channels jumpered route 66 comp only and Rust Booster III at very low gain setting 2-3 at the most
50th Strat
both volumes set at 2.2 ish

https://app.box.com/s/o0xaucw4nb39ibxazsu9n4cme6onwv5i

_________________
Keepn' the Blues Alive

2004 50th Ann. Limited edition AMSE Stratocaster
2017 50's Baja Telecaster BSB

1968 Bandmaster with 2X12 cab C-rex speakers
VHT Special 6 Ultra combo

Visual Sound Route 66
Cmatmods Signa Drive


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Profile
Post subject: Re: 68-69 drip edge Bassman /circuit changes
Posted: Mon Apr 27, 2015 7:02 am
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blues bondsman wrote:
Filter caps are on order !
They were out of 16uf 475 so I ordered an extra 22uf 500V far that last stageSteve I did go ahead and get the 100uf 450 volt for the first stage

I hope to photograph this procedure in great detail for future Bassman Tweakers

First thing ya need is one of these to drain off the voltage in the caps to keep from being injured :shock:
Image



20 or 22mfd/500VDC cap will work fine in the final stage. May even make the amp quieter, as this last stage feeds the input. No problem with the rectification --- as long as the solid-state diodes are up-to-par.


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Post subject: Re: 68-69 drip edge Bassman /circuit changes
Posted: Mon May 04, 2015 1:26 pm
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Another filter cap job done
I went forward using Metal Oxide resistors and F&T electrolytic caps
The bias board and other Lytics on the boards had all been replaced earlier
Image
I also used my meter to check for voltage even while the draining resistor was installed, just in case !!!
Being safe really isn't that hard when dealing with this procedure 8)

Image

Image

Notice the underboard wiring of the two big caps and the 220K resistors

_________________
Keepn' the Blues Alive

2004 50th Ann. Limited edition AMSE Stratocaster
2017 50's Baja Telecaster BSB

1968 Bandmaster with 2X12 cab C-rex speakers
VHT Special 6 Ultra combo

Visual Sound Route 66
Cmatmods Signa Drive


Last edited by blues bondsman on Mon May 04, 2015 1:32 pm, edited 1 time in total.

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Post subject: Re: 68-69 drip edge Bassman /circuit changes
Posted: Mon May 04, 2015 1:28 pm
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more procedure pictures

Image
Bothe the caps and the board are marked for polarity ( in case i forget) LOL !

Image

Image
Completely unsoldered board

_________________
Keepn' the Blues Alive

2004 50th Ann. Limited edition AMSE Stratocaster
2017 50's Baja Telecaster BSB

1968 Bandmaster with 2X12 cab C-rex speakers
VHT Special 6 Ultra combo

Visual Sound Route 66
Cmatmods Signa Drive


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Profile
Post subject: Re: 68-69 drip edge Bassman /circuit changes
Posted: Mon May 04, 2015 1:30 pm
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Image

And done !
found a real 69 OT on E-bay and its on the way !!!

So nice to have real Fender tone again !!!

_________________
Keepn' the Blues Alive

2004 50th Ann. Limited edition AMSE Stratocaster
2017 50's Baja Telecaster BSB

1968 Bandmaster with 2X12 cab C-rex speakers
VHT Special 6 Ultra combo

Visual Sound Route 66
Cmatmods Signa Drive


Top
Profile
Post subject: Re: 68-69 drip edge Bassman /circuit changes
Posted: Mon May 04, 2015 6:33 pm
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Good job! With those new parts in the power rail, the amp's PSU should be good for many more years.

Nice that you found an original tranny.

Tell us how the amp sounds, after the fixes.


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Post subject: Re: 68-69 drip edge Bassman /circuit changes
Posted: Tue May 05, 2015 5:31 am
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Sounds sweet now ! I'm using two 1x12 cabs with one Swamp Thang and one Governor from eminence
Rich full sound !
The OT in it is again from a Fender "75" amp from the 80's and has all other taps cut and taped off.

Being OCD cost me $$$ all the time and I just had to have the correct OT in there, I'll bet its gonna be sweet !!!
Image

Image

Pictures on new tranny that should be here by the weekend

_________________
Keepn' the Blues Alive

2004 50th Ann. Limited edition AMSE Stratocaster
2017 50's Baja Telecaster BSB

1968 Bandmaster with 2X12 cab C-rex speakers
VHT Special 6 Ultra combo

Visual Sound Route 66
Cmatmods Signa Drive


Top
Profile
Post subject: Re: 68-69 drip edge Bassman /circuit changes
Posted: Tue May 05, 2015 6:53 am
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Nice and BIG! Think that the Bassman have the heaviest OPT iron, of all the dual 6L6GC Fender amps. You prolly already know this... but watch the polarity of the secondary wires that go onto the 6L6GC's anode plates (pin 3). They were most likely switched when you blackfaced the amp's circuitry.


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Post subject: Re: 68-69 drip edge Bassman /circuit changes
Posted: Tue May 05, 2015 7:02 am
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I remember from the time Art sent me another 69 tranny
I'll check it out

_________________
Keepn' the Blues Alive

2004 50th Ann. Limited edition AMSE Stratocaster
2017 50's Baja Telecaster BSB

1968 Bandmaster with 2X12 cab C-rex speakers
VHT Special 6 Ultra combo

Visual Sound Route 66
Cmatmods Signa Drive


Top
Profile
Post subject: Re: 68-69 drip edge Bassman /circuit changes
Posted: Fri May 08, 2015 2:25 pm
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The correct 022871 1969 Transformer showed up today !!! YAHOO !
Image
Old wiring
Image
wrong Tranny
Image

_________________
Keepn' the Blues Alive

2004 50th Ann. Limited edition AMSE Stratocaster
2017 50's Baja Telecaster BSB

1968 Bandmaster with 2X12 cab C-rex speakers
VHT Special 6 Ultra combo

Visual Sound Route 66
Cmatmods Signa Drive


Top
Profile
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