Lowfreq
Well-known member
[quote author="Shenes"]Hi,
I'm thinking of building a couple of G1176 based on boards from Mnats. But this thread is making me a bit confused. The current version for sale in the black market is the rev J and this new version is rev D? Why "D", am I missing something? In what way is this new version different?[/quote]
Mako can probably fill you in on this better than me, but the Rev D refers to one of the models of the origional units. There are a few different versions out there. The G1176 is based off a Rev F or G I think?
There's a few threads around here explaining the differences of the different revs.
[quote author="edanderson"]oh dear, has everyone now done the homework that jens assigned? i don't like to see this question come up over and over either, but it is confusing. here are some cliffs notes that i hope will be helpful:
the rev A and B units (blue stripe) have a total of ~50db of system gain, with a 5db lower threshold point than the rev C-F (black face) which have ~45db of system gain (the F has a class AB output amp, C-E class A). this means that if you were to turn the input knob to the same place on both a blackface and a bluestripe, and send them the same signal, the blue stripe would go into action first. so you would naturally set the input control lower on a blue stripe (to get a similar threshold), and that is what the extra 5db of gain is for... to make up for the extra attenuation at the input.
the purple and the UA are both based on the rev D/E units, so they both should have 45db of system gain. the purple MC76 and MC77 are tested for that before they leave the shop. the earlier and perhaps present UA units probably do, but they had that "mid era" where they re-did the front end, so who knows for sure.
the g1176 is based on the later rev G (the first silverface). revs F-H used an output transformer (B11148) that was configured as 1:3.5 (10db gain) for the domestic market or 1:1 (unity gain) for export to europe. the gyraf PCB uses a lundahl output as a 2:1 stepdown (6db loss). some people modified the PCB to reverse the transformer. the mnats PCB has options for various 1:2 stepup (6db gain) transformers. and the front end is either an opamp (rev G) or a bridging transformer before a pot, similar to the solution UA used in their "mid era" reissues (to be contrasted with an attenuator before the transformer, as in the rev F and earlier). finally, the threshold sensitivity is again different on the rev G, so the input knob settings do not translate well from a rev G to the D/E units.
ANYWAY, there are many options with the g1176, and yes you can make something mighty close to a rev G or even a rev F if you source all the right parts. i think experimentation is great and you can certainly make some interesting custom units. try a 31267 on the input and a lo2567 on the output, for example. or a cinemag version. or the OEP versions on the mnats PCB. lots of options.
that said, the class A output section of the rev D/E, as found in the purple units/kit, is different from what you can do with the g1176. and that is the sound some people are after.
ed[/quote]
Here's the full thread wth a lot of discussion on the various 1176's
http://www.groupdiy.com/index.php?topic=18160&postdays=0&postorder=asc&highlight=1176&start=0
As for the rev J, it's Mako's own naming for his pcb version of the G1176(with some very handy additonal features)
I'm thinking of building a couple of G1176 based on boards from Mnats. But this thread is making me a bit confused. The current version for sale in the black market is the rev J and this new version is rev D? Why "D", am I missing something? In what way is this new version different?[/quote]
Mako can probably fill you in on this better than me, but the Rev D refers to one of the models of the origional units. There are a few different versions out there. The G1176 is based off a Rev F or G I think?
There's a few threads around here explaining the differences of the different revs.
[quote author="edanderson"]oh dear, has everyone now done the homework that jens assigned? i don't like to see this question come up over and over either, but it is confusing. here are some cliffs notes that i hope will be helpful:
the rev A and B units (blue stripe) have a total of ~50db of system gain, with a 5db lower threshold point than the rev C-F (black face) which have ~45db of system gain (the F has a class AB output amp, C-E class A). this means that if you were to turn the input knob to the same place on both a blackface and a bluestripe, and send them the same signal, the blue stripe would go into action first. so you would naturally set the input control lower on a blue stripe (to get a similar threshold), and that is what the extra 5db of gain is for... to make up for the extra attenuation at the input.
the purple and the UA are both based on the rev D/E units, so they both should have 45db of system gain. the purple MC76 and MC77 are tested for that before they leave the shop. the earlier and perhaps present UA units probably do, but they had that "mid era" where they re-did the front end, so who knows for sure.
the g1176 is based on the later rev G (the first silverface). revs F-H used an output transformer (B11148) that was configured as 1:3.5 (10db gain) for the domestic market or 1:1 (unity gain) for export to europe. the gyraf PCB uses a lundahl output as a 2:1 stepdown (6db loss). some people modified the PCB to reverse the transformer. the mnats PCB has options for various 1:2 stepup (6db gain) transformers. and the front end is either an opamp (rev G) or a bridging transformer before a pot, similar to the solution UA used in their "mid era" reissues (to be contrasted with an attenuator before the transformer, as in the rev F and earlier). finally, the threshold sensitivity is again different on the rev G, so the input knob settings do not translate well from a rev G to the D/E units.
ANYWAY, there are many options with the g1176, and yes you can make something mighty close to a rev G or even a rev F if you source all the right parts. i think experimentation is great and you can certainly make some interesting custom units. try a 31267 on the input and a lo2567 on the output, for example. or a cinemag version. or the OEP versions on the mnats PCB. lots of options.
that said, the class A output section of the rev D/E, as found in the purple units/kit, is different from what you can do with the g1176. and that is the sound some people are after.
ed[/quote]
Here's the full thread wth a lot of discussion on the various 1176's
http://www.groupdiy.com/index.php?topic=18160&postdays=0&postorder=asc&highlight=1176&start=0
As for the rev J, it's Mako's own naming for his pcb version of the G1176(with some very handy additonal features)
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