My 45/100

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My 45/100

Postby David B » Mon Feb 19, 2018 2:12 am

My 45/100, with pretty much all modern parts, build on Brian's 45/100 chassis, Marstran iron of course, alpha pots, last of my old Sozo stash from when they first came out in well whenever that was.
Fun amp to play.

other details

1204-43 PT running on the 490v tap, 1202-84 OT & 3H choke.Gold Lion KT66 & Mullard ECC83's

Half a$$ Dickinson spec, I did the 33K/500pf tone stack but left the preamp filtering at 16uf, might change that to the 32x32 and add the extra 10k dropping resistor just to see if there's much difference.

db

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Re: My 45/100

Postby Brian Wallace » Fri Feb 23, 2018 9:48 pm

Now thats pretty. :D
Remember....You can fix it with a little extra energy and a positive attitude. ;)
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Re: My 45/100

Postby David B » Sat Feb 24, 2018 12:26 pm

Thanks Brian, and pretty loud :twisted: Picked up an Alex to pad it down a bit, nice attenuator 8)
She's still naked so a cab is next..



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Re: My 45/100

Postby David B » Fri Mar 09, 2018 5:49 pm

And a close up of the Hunts. NOS .05 , Thanks S.Marshall

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Re: My 45/100

Postby Brian Wallace » Sun Mar 11, 2018 6:55 pm

Very nice. Where is Steve and Dai for that matter?
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Re: My 45/100

Postby David B » Sun Mar 11, 2018 7:08 pm

Dunno, seems both have gone off the radar. :?
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Re: My 45/100

Postby neikeel » Sat Mar 24, 2018 10:58 am

Nice build David, saw pics on Marshall forum, good to see traffic here.

S Marshall was off radar for a while but is posting a bit on Marshall forum.

Not seen anything from Dai since VAF went under (still hoping Vic will revive it or pass it on to someone else as there is an unbelievable amount of excellent information there).

As I mentioned in a post mine is finally finished (was sitting with the parts accumulated over at least 3 years (maybe more) with one of Brian's run of 45/100 chassis (whenever that was) and his PT and OT. I used a Metro paper bobbin 354-114 choke tho' (only because they look right vs the C1999, which I am pretty sure are same spec. - correct Brian?).

If mine does not blow up tonight when I soak test it I will post some pics :D
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Re: My 45/100

Postby David B » Sat Mar 24, 2018 12:07 pm

Thanks Neil,

Yeah I saw Steve's post, was hoping he would produce some chassis :)
Any word on Vic's plans? indeed years of great information on that site..

IIRC Brian made those in 2010? mine sat for a while till the urge hit to build something, might want to do another with old parts & maybe a block end chassis as they are stronger. BTW I did have the corners on mine welded to hold those heavy a$$ed trannies..

Can't wait for the pics! Soak test it :shock: :twisted:

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Re: My 45/100

Postby neikeel » Sat Mar 24, 2018 2:30 pm

Hmm.....

Spoke too soon :evil:

All voltages check out, so plugged in, switched on, nothing :roll: .

No hum, no buzz, nothing, slight squeak from output grids when touched with meter probe......

I can normally build stock Marshalls in my sleep.

No more time today (Honey Dos to be sorted) also have a sulky Ampeg SVT CL some time tomorrow (that's a nuisance to work on!)

Will have to drag the test gear out to see where it is amiss (sig gen, scope etc) had them out for checking over some tweaks on my sons project amp (more on that later) but put them all away again - too soon!!

Odd there is nothing at all, I remember an issue Thorlief had with OTs ages ago (Mine is 1202-84, HTS-7900-1, 9961015). We have 560v on the anodes of V4-v7 with -60v on the grids.

More later :wink:
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Re: My 45/100

Postby David B » Sat Mar 24, 2018 3:07 pm

Oh no! well no smoke is good 8) Could be something simple in the inverter, 10K tail resistor or my fave that 470r :oops:

Happy hunting..





db
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Re: My 45/100

Postby neikeel » Sat Mar 24, 2018 6:15 pm

Easy fix!
Missing internal link on the output selector plug!
That is why it was TOTALLY quiet.
Well let it soak tonight and see!
Neil
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Re: My 45/100

Postby neikeel » Sun Mar 25, 2018 6:45 pm

All running beautifully.
soak testing has been continued with 17 year old son playing through it for the evening.
Making my Alex attenuator smell so it must be kicking out some watts!
First spin was pure jazz (all EQ on 5 and volume on 4 - no attenuator).
Turning up the wick it has a surprising amount of gain for a 45/100 (or just more upper mids with altered tone stack and slightly lower V1 voltages?)
It did smoke my snubber cap (NOS 600vac RMS RS non-polarised) so it does not have one at the moment, need 1000v so going to trawl fleabay.
As promised pics and clips to follow :D
Neil
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Re: My 45/100

Postby David B » Mon Mar 26, 2018 7:40 am

Great to hear it was a minor fix, sorry your snubber got smoked :lol: You must be running the amp at the full 560 with real GEC’s? I’m afraid to do that :oops: Actually, I should post the voltages just to to have some reference…

Now I’m curious about the 32/32uf & extra 10K dropping resistor.
Sure once I see your amp I’m gonna wanna build another one :twisted:
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Re: My 45/100

Postby David B » Mon Apr 02, 2018 9:37 am

Neil,

Do you have the voltages jotted down for your new amp?
Would like to compare to my lower voltage version.

Thanks,

David
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Re: My 45/100

Postby neikeel » Mon Apr 09, 2018 9:43 am

Hi David
I will do, S.Marshall has offered me a cap too 8)
Hopefully post some pics here too.
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