1960 Bassman

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Re: 1960 Bassman

Postby Dean Jr. on Sat Mar 11, 2017 4:36 pm

Is the output transformer original? It should read #45429. iirc.....correction.....#45249...thanks, Clark.
Last edited by Dean Jr. on Wed Mar 15, 2017 7:47 pm, edited 1 time in total.
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Re: 1960 Bassman

Postby Naked Clarke on Wed Mar 15, 2017 7:05 pm

Dean Jr. wrote:Is the output transformer original? It should read #45429. iirc.


That should be 45249.
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Re: 1960 Bassman

Postby Dean Jr. on Wed Mar 15, 2017 7:46 pm

Thanks for the correction....45249 is correct.
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Re: 1960 Bassman

Postby h8hoos on Sun Mar 26, 2017 11:42 am

45249 it is.
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Re: 1960 Bassman

Postby Dean Jr. on Mon Mar 27, 2017 9:24 pm

IF that 2 ohm OT is still in good working order after being used at a 200% mismatch to the high side, then it is a lucky OT>
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Re: 1960 Bassman

Postby drewleslie on Tue Mar 28, 2017 12:05 pm

Hopefully its a 4 ohm 15.
How can you tell the difference between a chemist and a plumber? Ask them to pronounce 'unionized'.
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Re: 1960 Bassman

Postby Dean Jr. on Tue Mar 28, 2017 4:04 pm

h8hoos wrote:Speaker tested at 8 ohms. I was able to plug the speaker into another amp and it works perfectly. Still deciding on what direction to go with the electrical side of it.



Nope....OP says it tests as an 8 ohm. The possibility....in this case perhaps probability is more accurate...of flyback voltage piercing the insulation on the secondary windings would make this OT a big question mark for me. IF it were for sale, I would have to take that mismatch into account, and the value would be compromised for me.
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Re: 1960 Bassman

Postby h8hoos on Tue Apr 11, 2017 11:12 am

Best I can tell is that the 15 was never used with this chassis. There is a "rigged" 1/4' plug on it that gives the appearance that it was being used as a cabinet with a different head. That's how I connected it to another head that I have. My electrical guru has been through it and it output transformer checks out.
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Re: 1960 Bassman

Postby Dean Jr. on Tue Apr 11, 2017 3:23 pm

IF so, then that is a relief, right? :thumbsup:
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Re: 1960 Bassman

Postby h8hoos on Sat Apr 15, 2017 12:54 pm

Comments from my local friend that is digging in on the amp, direct quote:

For the most part Paul and I were of similar mindset.

He noted after see the pictures that it was a very nice find and “the real deal”.

He was ok with not changed the selenium rectifier (finned looking thing), I’m less comfortable, but that’s your call.

He says filter caps are not original to the unit. I’m thinking they should be changed, as does he. One is starting to vent.

As far as the presence mod, you could go either way. The 25K pot is not original, nor is the one next to it.

Your choices are to revert it back to original spec with new 5K pot or finish the mod that someone started.

The unit was made in a transition period and the choke is likely correct for the unit. Just not well documented.

He feels it is ok to run the single 15 speaker; I’m not as comfortable. There are some Jensen 10” re-issues floating around. Best price is about $100 each.


He recommended Cary Wright 714.403.8493 to restore the cabinet.

So minimum:

New correct tube sockets for output tubes.
Replace missing hold down so the tubes don’t fall out.
Correct green filament wire to replace orange and gray pvc wire.
New filter caps (under the dog house cover).
Resolve Presence control one way or the other. Either finish to 6G6 specs or buy modern 5K pot.
New Speaker jack if you are going to run Four 10” speakers.
Grounded cord. Removal of grounding capacitor (death cap).
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Re: 1960 Bassman

Postby h8hoos on Fri Apr 21, 2017 12:36 am

I am starting to get a bit excited, as my local electrical guru expert is telling me that my Bassman is coming together nicely. Won't be long before I have to make a decision on speakers. At this time my options are:

1. Rob the 10" blue alnico speakers from my first year Blues Deville
2. Rob the 10" ceramic Jensens from my late model 59 Bassman LTD
3. Check out Webers, Jensens, Tone Tubbys, etc
4. Other ideas that you guys may have

I sure hope y'all will chime in.

Thank you.
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Re: 1960 Bassman

Postby Dean Jr. on Fri Apr 21, 2017 5:26 pm

#1...IF they are the bright blues, those are Eminence Legend Alnicos and are very, very close to what came in the tweed Bassman amps originally.
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Re: 1960 Bassman

Postby spoond on Mon May 15, 2017 5:41 pm

http://m.ebay.com/itm/Jensen-P10r-Smoot ... Ciid%253A1

How about these? A lot of $ but you can find less purty original Jensen P10Rs if you look carefully without spending a whole lot of money. Recone as necessary. IMHO original P10Rs are the only way to go for a 4x10 Bassman.

That amp looks like a good candidate for a recover and correct grill cloth. Restore all wiring and the board to stock. Put in a new baffle board and correct speakers and it is a great player. One thing I would also emphasize is, even if they have been changed already, replace the power supply caps with new blue Sprague Atoms.
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Re: 1960 Bassman

Postby eolon on Fri May 19, 2017 2:20 am

Lovely amplifier! Have you tried putting power to the amp? As you know, the 5F6-A Bassman is probably one of the best, if not THE best amplifier ever made by Fender. It was the circuit that Marshall copied to build their early amps. Here is a photo of a 5F6-A reproduction that I built last year. It took quite a while working with Weber to find just the right speakers to emulate the original Jensen P10Rs, but they turned out to sound great in the amp. I would suggest keeping the circuit intact and as original as possible. Do not fall for the myth that all the old electrolytic capacitors have to be replaced - that's not always the case, there are plenty of 45+ year old capacitors still functioning as they should. You can have each capacitor tested and only replace the ones that are bad; same thing with the Astron film capacitors.

If you end up replacing components in the amp, try to get reproduction parts that look like the originals - see the new reproduction caps in the Bassman that I built. It doesn't affect the tone or the reliability of the amp, but it looks nice, and I suspect it might be worth more to a future buyer who takes off the back cover. Just my opinion.

Keep the 15" speaker if you like it. It probably won't sound exactly like a 5F6-A with four tens, but I bet it will sound very good!

I have never heard of a 5F6-A that came with a 15" speaker, although lots of people have converted Bassmans from 4-10s to 1-15. The first Bassman amp of 1952 used the Pro cabinet ("TV Front") with a 15" Jensen P15N "Special Design" speaker. One of the reasons Fender moved to the 4-10s of the 5F6-A was because the single 15 seemed to blow up a lot, especially at low (bass) frequencies. If your amp had a 15" speaker from the factory, then it is indeed a rare and probably unique amp.

Best Regards,

Don


Image
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Re: 1960 Bassman

Postby eolon on Fri May 19, 2017 2:35 am

The speakers I finally decided were an excellent match for vintage Jensen P10Rs were the Weber 10A125, 20 Watts, ribbed cone, standard dustcap, lightly doped. They sell for about $100 each.
A good set of 4 Jensen P10Rs from 1959 -1960 often sell for $1,000+. And I would be leery of 50-year-old paper cones. The 10A125s are designed specifically to emulate the 1959 Bassman. The sound is awesome.


Best Regards,

Don.
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