1203 80 and t2562

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1203 80 and t2562

Postby blooze » Mon Aug 03, 2009 8:12 am

hello

Is the 1203 80 the right pt for blackflag and 10xxxseries amps.
(is it used in other versions too 12xxx?)

what is the voltage on the 1203 80 low and high secondary taps.

Is the marstran 1203 80 a laydown or stand-up transformer.

Can i build amps with single or dual rectifier with this Transformer.(or are there different versions of 1203 80 transformers for single or dual rectification .




Has the marstran t 2562 low and high secondary taps too.
What is the voltage for this transformer before and after rectification?

On the marstran site the t2562 is a stand up transformer.
Is the tw2562 not a laydown transformer?

On the marstran site the t2562 is a stand up transformer.
Is the t2562 not a laydown transformer?

i plan to build
(12xxxseries vh amp or 69 1959 Super Lead 100W - Hendrix amp)


http://www.amparchives.com/album/Marsha ... index.html

thank you
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Re: 1203 80 and t2562

Postby neikeel » Mon Aug 03, 2009 6:06 pm

Both are interchangeable in my experience

I used both as laydown types

both give about 490v rectified on hi and around 400v on low. The 1203-80 from Brian uses two separate secondaries so that you can use two rectifiers in parallel or simply link the inners as a centre tap and use the outers as ac feeds to a single rectifier.

I used the 1203-80 in a Black Flag an T2562 in a 68 rebuild and 12 series clone but IIRC I may have used metro versions ( but Marstran OT in the Black Flag for sure).

I can post pics if you like :wink:
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Re: 1203 80 and t2562

Postby blooze » Mon Aug 03, 2009 7:24 pm

hi

Is the drawing from Brian


Image



still up to date with the marstran 1203 80 from today?(dual rectifer)

There is no laydown t2562 no more so the marstran 1203 80 is the pt for the blackflag dualrectifier for the 10xxx single and 12xxx single rectifier?

Is there any difference in sound between the metro one B+ secondary or the marstran two B+ secondary windings 1203 80 if used only as single rectifier?

I think to get the c1998 and 1202 119 or 132 and mess around with those three versions.
Last edited by blooze on Thu Aug 06, 2009 12:28 pm, edited 1 time in total.
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Re: 1203 80 and t2562

Postby neikeel » Tue Aug 04, 2009 6:11 pm

My 12 series had C1998 and T2562 (as laydown) and the Black Flag 1202-132 and 1203-80 wires as single rectifier (although looks like a double - as I wired two bridges in parallel mainly for aesthetics):

Image


Image

I bundled and tied in the loom on the bottom one after I fitted the Hi-Lo voltage switch (virtual variac). Amp since sold to Holland and being used and recorded by Ruben 8) :wink:
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Re: 1203 80 and t2562

Postby blooze » Thu Aug 06, 2009 12:44 pm

1)
for a vh 12xxx(with a high and low voltage switch)
According to the marstran wiring diagram the t2562(on the site its called the jmp100 pt)
has no low and high voltage tape.
i think there is only a stand up version on the marstran site too.

for a 12xxx(with a high and low voltage switch)
If I use the marstran 1203 80 instead, (dual rectifier version) I hope it’s a laydown version,there is no info or pic on the site.

How should I wire this transformer for the low and high voltage option and single rectification?
should I wire the 2 taps C and D together (on the drawing it s B and C)

(or should i buy the single rectifier version of this PT ) :(

2)
for a black flag build with dual rectifier

should I wire the marstran 1203 80 .( dual rectifier version)
like this ,is the drawing up to date with the version from today

Image

drawing
Image
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Re: 1203 80 and t2562

Postby Brian Wallace » Thu Aug 06, 2009 6:20 pm

That's an old drawing (2005) and needs updating. Here are the two rectifier versions using the 1203-80.
Remember....You can fix it with a little extra energy and a positive attitude. ;)
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Re: 1203 80 and t2562

Postby blooze » Fri Aug 07, 2009 6:46 am

Thank you for the answer I knew that cannot be the actual drawing.
That old drawing gave me really a headache. :?:

If I build a 12xxx can I connect C and D to form a centre tap and wire them to ground?
That s not my pic, just as an example
Image
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Re: 1203 80 and t2562

Postby Brian Wallace » Fri Aug 07, 2009 7:17 am

If you are going to use the bridge rectifier shown in your picture, I would not ground the CT. Wire the rectifier up just like the single rectifier example.
Remember....You can fix it with a little extra energy and a positive attitude. ;)
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Re: 1203 80 and t2562

Postby neikeel » Fri Aug 07, 2009 1:59 pm

I hooked up my common/centre tap (white wire on my pic) to the middle of the mains filter cans.

My rectifiers are actually only one bridge with each rectifier 'sitting above the other' with each corner tied (two to AC in) one to B+ out and the other to ground of the filter caps (as you see there).

All my voltages are spot on and the amp seems to run ok, hope there is not a reason why it should not :oops:
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Re: 1203 80 and t2562

Postby Roe » Sat Aug 08, 2009 5:56 pm

any comments on how the dual rectifier sounds compared to the single one? will it have a slower response?
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Re: 1203 80 and t2562

Postby Roe » Sun Nov 15, 2009 8:21 am

Will not the dual rectifer lead to a higher impedance in the power supply? shouldn't this give a slower response and more ghosting?
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Re: 1203 80 and t2562

Postby Roe » Mon Nov 16, 2009 6:57 am

also FREDs in the power supply leads to lower impedance than the n4007s. I guess UF4007 have lower impedance than the n4007s as well.
For some purposes higher impedance need not be bad. although it can lead to ghosting, a slower response and flubby bass, it can also lead to more compression and some responsiveness from the amp
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Re: 1203 80 and t2562

Postby Roe » Tue Feb 16, 2010 6:51 am

does the 1203 deliever ca 400v if you use the low voltage taps? can you use the low voltage taps on one secondary and the high voltage taps of another for 440-450v?
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Re: 1203 80 and t2562

Postby Roe » Thu Jun 02, 2011 6:44 am

Brian Wallace wrote:That's an old drawing (2005) and needs updating. Here are the two rectifier versions using the 1203-80.


how should the standby switch be attached to the the dual rectifier version? just like a fender (after mains caps)?
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Re: 1203 80 and t2562

Postby shakti » Fri Jun 03, 2011 9:46 am

I wired mine after the mains caps.
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