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Old 3rd January 2011, 07:22 AM   #71
rrrremus is offline rrrremus  Germany
diyAudio Member
Join Date: Sep 2009
Location: Timisoara
Hello guys. I already build a few EQs on a test board and i obtained quite interesting results. I will fit the EQ with trimmers so i can tweak them to my liking. I am currently drawing the first PCB for the playback amp and i will try to post it here. Please tell me if i missed anything, any feedback is appreciated.

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So the few things that i know that are missing here are the muting circuit and the swtichable gain for 9-19cm/s that i plan to fit on the second op-amp.

I tested this circuit and it sounds excellent compared to the original one.
I will now build the recording circuit, so that i can measure the response of the complete circuit.
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Old 24th January 2015, 03:40 AM   #72
rtrg is offline rtrg
diyAudio Member
Join Date: Jul 2013
Default open reel

Originally Posted by Brett View Post
Modify one for improved performance, or build one from scratch?

The first is certainly possible, and can be done using most of the modification proceedures laid out on the boards here and elsewhere for the electronics. Mechanical mods are an area where you need some expertise, measuring tools, and an alignment tape. They can be fussy beggars.

To build one from scratch is also possible, but it would take all of the above, lots of money and dedication, time and the ability to fabricate a lot of small high precision parts. If you do it, you would be my diy hero.

However, theres no need to build from scratch. Open reels go for very little money, and can be readily modified, but it is the most expensive of DIY projects (I speak from experience). Pick a Studer or Revox or Tascam as they are still supported from the factory, although parts can be expensive. A MINT Teac, Akai GX, Pioneer RT would be an OK second tier choice.

I can answer more, but what do you want to do in detail?
I have been fooling around with open reels forever. I finnaly got around to building my own transport using components from several dead units which also includes the preamps. In the past I was successful in mating a TEAC 3300 transport with the preamp from a 2300. I needed to use the entire 2300 harness minus the 3 motors in order to make this work. I ended up using switches and relays for the transport and the keypad plus harness from the 2300. I am looking for a simpler approach.

Is there any deck probably a 7 inch that is designed in such a way that the pre is connected to the transport by a single connector which would only require a power supply(ies) to work independently of the transport? Of course there should be NO audio circuits in the transport. If there are then I would need to use the entire harness again.

The various versions of the TEAC 4010 are candidates but again I need to use the entire harness plus the interconnecting cables for the 1st gen. Any ideas? Details please. reeltoreelguy@gmail.com.
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