Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: tonewood on October 04, 2012, 11:23:22 am
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I have only rebuilt old point to point amps, tape recorders & record players. I would finally like to start from scratch and use turret boards. I recently saw mention of Hoffman vs Parallel style layout and am not sure what that means. Can someone point me to a "classic" or typical example of each?
Thanks!
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Get into Hoffman's sales catalogue and pull up his turret boards for the Bassman, 5E3, Tweed Overdrive Special ............... etc.........
Those are Hoffman style boards and they're sturdy and make sense.
A paralleled board would be like for a Vox or Hiwatt amp. These are useful in developing a prototype or draft design because they're so easy to re-arrange components on in the design layout. Once the design is completed, a Hoffman style board is an excellent board to work with.
With respect, Tubenit
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You could put hundreds of tags/turrets every 0.2" both ways on a board, and just use the ones you need... that would be expensive. Maybe confusing.
The universal way is two (parallel) rows of tags on narrow board. Many-many classic boxes, from radar to multiplex telephone filters to Voxes, were built on this stuff.
Fender bought blank board and a shoe eyelet punch, put eyelets only where needed. Mostly two rows, but if an eyelet at some random place made things better, that's what he did.
Hoffman generally uses the Fender approach except with much better board and turrets (and of course some layout differences where his taste differs from Fender).
2-row tagboard is universal, avoids custom punching. While you probably end up paying for a few tags left un-used, the cost is not large.
If you like using power tools, sawing drilling and bashing blank board is fulfilling, and gets a "perfect" board. If you are building many identical amps, this can become cheaper.
Doug Hoffman now has a service where his robot does the tedious work for a full-custom board, saving you the tool-investment and dust.
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his robot does the tedious work
i love robots... i used to work in hybrid mfg. fact. (crydom) we made HV bridge rectos & hybrid SCR/diode bridges. we printed and fired our own substrates. we had an automated printing press.... new and big job, but one of the silkscreens from the printer was reversed. loaded 1000 subtrates to print and fire palladium silver on alumina. came back from lunch and robot hammered out 1000 rejects.
gotta love robots - they do exactly what you tell 'em to... :BangHead:
i like using paralleled tag strips - it costs less. less fabrication.
--DL
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I tried to put 700vdc on the plate of a 6v6
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Thank you all for the info!