Why scratch build what you can buy used?

Posted by Russ57 on December 4, 2004 at 09:08:23

In Reply to: Starting a DIY project... posted by 7591 on December 4, 2004 at 06:40:29:

Given what you say I think you would be better served buying a used amp. I hear what you say about needing a fix. But by redesigning parts of the amps circuit you can get that. Dynaco's are hard to beat. Good output iron based around common tubes. Either the EL34 or 6550 will do given your desired wattage. The Dynaco amps are kinda perfect because they do need a redesigned front end circuit so that will provide your fix. You could either scratch build or buy an aftermarket one. Later on a new power transformer and choke input supply could be added along with a new chassis. You could experiment with levels of feedback as well as triode strapping of the output tubes. Point being that you can do anything from use ready built boards with instructions and loads of support to scratch building a new front end and power supply on a different chassis. And to top it off you won't have any problem selling things along the way, such as the stock driver board and power transformer.

I wouldn't do the Mac thing unless you just want to restore and set it on a shelf. And I wouldn't do a ground up DIY thing unless you wanted something you couldn't easily buy used...something with CCS's, grid chokes, interstage transformers, non-standard tubes...etc.

You might wish to try a mix of parts and avoid using the same resistors and caps everywhere.

Also you will need a preamp. The foreplay would be a good one to consider and would help feed the fix. Lots of options for the foreplay to keep the fix going too:)

Russ

This post is made possible by the generous support of people like you and our sponsors:

Follow Ups Full Thread

Topic - Starting a DIY project... - 7591 06:40:29 12/4/04 (15)

Consider Plitron / Vanderveen Trannies - Dr Deville 18:20:20 12/4/04 (0)

well - Sector-7G 15:41:25 12/4/04 (2)

Agreed 100% - SomeJoe 19:06:09 12/4/04 (1)

Agreed 100% - Sector-7G 05:15:10 12/5/04 (0)

Why scratch build what you can buy used? - Russ57 12/4/0409:08:23 12/4/04 (3)

Try rebuilding some used EICO monoblocks - Salectric 14:07:48 12/4/04 (2)

You're certainly welcome. Good luck! (nt) - Salectric 15:48:34 12/4/04 (0)

Re: Try rebuilding some used EICO monoblocks - 7591 15:03:12 12/4/04 (0)

Look at Herbert Keroes original circuits. - grhughes 07:23:16 12/4/04 (3)

Re: Look at Herbert Keroes original circuits. - Henry Pasternack 08:00:59 12/4/04 (2)

Re: Look at Herbert Keroes original circuits. - 7591 14:50:25 12/4/04 (1)

Re: Look at Herbert Keroes original circuits. - Henry Pasternack 15:18:38 12/4/04 (0)

forgot to add... - 7591 07:12:49 12/4/04 (2)

One 5AR4 is full wave - Russ57 09:23:51 12/4/04 (0)

Look at the Marantz Model 2 amp - grhughes 07:32:38 12/4/04 (0)

Follow Ups

Why scratch build what you can buy used? - Russ57 12/4/0409:08:23 12/4/04 (3)

Try rebuilding some used EICO monoblocks - Salectric 14:07:48 12/4/04 (2)

You're certainly welcome. Good luck! (nt) - Salectric 15:48:34 12/4/04 (0)

Re: Try rebuilding some used EICO monoblocks - 7591 15:03:12 12/4/04 (0)

You can not post to an archived thread.