new dumble build in bassman head chassis
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new dumble build in bassman head chassis
Hi guys,
Here goes.
I have decided to attempt a Dumble build in a Bassman 50 head chassis. From what you guys have said, the iron was used by Mr Dumble himself. So that is one part sorted. Hererwith are pics of the donor chassis.
[IMG768]http://i48.photobucket.com/albums/f214/ ... hojrog.jpg[/img]
Out of cab. Sorry about bad pics.
[IMG:768:1024]http://i48.photobucket.com/albums/f214/ ... kq6isi.jpg[/img]
[IMG768]http://i48.photobucket.com/albums/f214/ ... bzuapi.jpg[/img]
[IMG768]http://i48.photobucket.com/albums/f214/ ... nufreq.jpg[/img]
Codes on iron Mains PT (a bit blured and upside down)
[IMG768]http://i48.photobucket.com/albums/f214/ ... rhuyr6.jpg[/img]
OT
[IMG768]http://i48.photobucket.com/albums/f214/ ... lgh0t5.jpg[/img]
Choke
[IMG768]http://i48.photobucket.com/albums/f214/ ... 57lbxo.jpg[/img]
Back of chassis number
[IMG768]http://i48.photobucket.com/albums/f214/ ... i74o4r.jpg[/img]
May somebody can help with dating. Looks to be 69?
I will strip and start to clean tomorrow and post.
ANY input, coments and advice would be greatly appreciated.
Here goes.
I have decided to attempt a Dumble build in a Bassman 50 head chassis. From what you guys have said, the iron was used by Mr Dumble himself. So that is one part sorted. Hererwith are pics of the donor chassis.
[IMG768]http://i48.photobucket.com/albums/f214/ ... hojrog.jpg[/img]
Out of cab. Sorry about bad pics.
[IMG:768:1024]http://i48.photobucket.com/albums/f214/ ... kq6isi.jpg[/img]
[IMG768]http://i48.photobucket.com/albums/f214/ ... bzuapi.jpg[/img]
[IMG768]http://i48.photobucket.com/albums/f214/ ... nufreq.jpg[/img]
Codes on iron Mains PT (a bit blured and upside down)
[IMG768]http://i48.photobucket.com/albums/f214/ ... rhuyr6.jpg[/img]
OT
[IMG768]http://i48.photobucket.com/albums/f214/ ... lgh0t5.jpg[/img]
Choke
[IMG768]http://i48.photobucket.com/albums/f214/ ... 57lbxo.jpg[/img]
Back of chassis number
[IMG768]http://i48.photobucket.com/albums/f214/ ... i74o4r.jpg[/img]
May somebody can help with dating. Looks to be 69?
I will strip and start to clean tomorrow and post.
ANY input, coments and advice would be greatly appreciated.
If it sounds good, it is good! Trust your ears
Re: new dumble build in bassman head chassis
Looks like it has some mods already... ...The year, looks like a 68 bassman to me ...I don't think it's a Bassman 50...
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Re: new dumble build in bassman head chassis
Has to be a 50w bassman! 2 x 6L6!! I believe it was "black faced"!
If it sounds good, it is good! Trust your ears
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Re: new dumble build in bassman head chassis
Actually, all the Bassman heads have 2 x 6L6's (or 5881's). If it's a Bassman 50, it should have 50 watts printed under the output jacks. If it doesn't have it, it' most likely a 40 watt amp.
Your amp has both 1968 and 1969 transformers and if I remember correctly, the Bassman 50 didn't come out until around 1972.
Also, it's interesting that your amp has "Bassman Export-Amp" on the faceplate, something I've never seen here in the U.S.
Based on the pictures, it looks to me like much more was done to the amp besides just "Black- Facing" it.
In my opinion, you have the best vintage iron for a 2 x 6L6 Dumble style amp and it's going to sound great!
Good luck with the project,
LDC
Your amp has both 1968 and 1969 transformers and if I remember correctly, the Bassman 50 didn't come out until around 1972.
Also, it's interesting that your amp has "Bassman Export-Amp" on the faceplate, something I've never seen here in the U.S.
Based on the pictures, it looks to me like much more was done to the amp besides just "Black- Facing" it.
In my opinion, you have the best vintage iron for a 2 x 6L6 Dumble style amp and it's going to sound great!
Good luck with the project,
LDC
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Re: new dumble build in bassman head chassis
Thanks for that info LDC.
The export logo was a multi-tapped PT (110-240v) version.
Looking forward to the build. Awaiting a quote on BOM from rj, then I will get started. Really looking forward to it!!
Will probably gut the amp first.
The export logo was a multi-tapped PT (110-240v) version.
Looking forward to the build. Awaiting a quote on BOM from rj, then I will get started. Really looking forward to it!!
Will probably gut the amp first.
If it sounds good, it is good! Trust your ears
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Re: new dumble build in bassman head chassis
Yes, every "Export Model" made by Fender for the overseas market has a multi-tapped power transformer. But, every "Export Model" I've ever owned (or even seen) has a standard Bassman-Amp faceplate, just like the domestic amps. Your amp has a "Bassman Export-Amp" faceplate and that's what I find so intriguing...
Cheers,
LDC
Cheers,
LDC
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Re: new dumble build in bassman head chassis
Andre, that looks like a cool start... I'll be interested in following along and see where you end up. rj
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Re: new dumble build in bassman head chassis
Found this on page 3 of Dumble Files. What do you guys think about this layout? Done in a bassman chassis!
[IMG768]http://i48.photobucket.com/albums/f214/ ... kfrypy.jpg[/img]
Built in dumblelator?
[IMG768]http://i48.photobucket.com/albums/f214/ ... kfrypy.jpg[/img]
Built in dumblelator?
If it sounds good, it is good! Trust your ears
Re: new dumble build in bassman head chassis
andresound wrote:Found this on page 3 of Dumble Files. What do you guys think about this layout? Done in a bassman chassis!
[IMG768]http://i48.photobucket.com/albums/f214/ ... kfrypy.jpg[/img]
Built in dumblelator?
You should have room since the electrolytic caps for the power supply will be underneath the chassis in the dog pan of the bassman.
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Re: new dumble build in bassman head chassis
Well, its confirmed, the amp is a 69!! PRIMO IRON!!!
I am told that the eyelet board in the above layout is the same as the bassman's. I will strip, clean and check boards for conductance and report back.
This build might be a bit "above my pay grade", but hey, how else am I going to learn!! .
I have to reiterate, the help I am getting from members and the time they have invested, is truly inspiring.
THANK YOU!!
I am told that the eyelet board in the above layout is the same as the bassman's. I will strip, clean and check boards for conductance and report back.
This build might be a bit "above my pay grade", but hey, how else am I going to learn!! .
I have to reiterate, the help I am getting from members and the time they have invested, is truly inspiring.
THANK YOU!!
If it sounds good, it is good! Trust your ears
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- Joined: Mon Dec 01, 2014 8:48 am
- Location: Durban South Africa
Re: new dumble build in bassman head chassis
Good source for period correct SPRAUGE caps???
If it sounds good, it is good! Trust your ears
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Re: new dumble build in bassman head chassis
Took out the main board. Cleaned boards and checked for conductance.
[IMG768]http://i48.photobucket.com/albums/f214/ ... da367l.jpg[/img]
[IMG:768:1024]http://i48.photobucket.com/albums/f214/ ... nl1gvz.jpg[/img]
[IMG768]http://i48.photobucket.com/albums/f214/ ... dw4spp.jpg[/img]
[IMG768]http://i48.photobucket.com/albums/f214/ ... jd9ivj.jpg[/img]
Next will be the Power supply board and then the chassis. Does anyone have the colour codes for the 69 bassman iron leadouts for choke, PT and OT?
[IMG768]http://i48.photobucket.com/albums/f214/ ... da367l.jpg[/img]
[IMG:768:1024]http://i48.photobucket.com/albums/f214/ ... nl1gvz.jpg[/img]
[IMG768]http://i48.photobucket.com/albums/f214/ ... dw4spp.jpg[/img]
[IMG768]http://i48.photobucket.com/albums/f214/ ... jd9ivj.jpg[/img]
Next will be the Power supply board and then the chassis. Does anyone have the colour codes for the 69 bassman iron leadouts for choke, PT and OT?
If it sounds good, it is good! Trust your ears
Re: new dumble build in bassman head chassis
Testing for conductance is not done I that way. This will lead to false negative results.
It is done in circuit. yeah.
Put B+ on one eyelet. Ground a couple of eyelets that are nearby. Then measure for leakage with the probe set to mV.
Try some free eyelets in the vicinity of the B+ one, and also the side of the board as well.
It is done in circuit. yeah.
Put B+ on one eyelet. Ground a couple of eyelets that are nearby. Then measure for leakage with the probe set to mV.
Try some free eyelets in the vicinity of the B+ one, and also the side of the board as well.
- martin manning
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Re: new dumble build in bassman head chassis
I don't see value in keeping the old board. Its warped condition suggests it has absorbed moisture at some point.
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Re: new dumble build in bassman head chassis
Thank you for that. Live and learn. The more I hang around here, the more stupid I feel!! No worries, all good.
I agree with Martin, no use in keeping old boards.
I agree with Martin, no use in keeping old boards.
If it sounds good, it is good! Trust your ears