Reddish 500 EQ
- Thread starter JMan
- Start date
Help Support GroupDIY Audio Forum:
Put me on the list for two sets!
I’m in for two sets.
bugfight
Well-known member
2 for me, please
OK, be aware of forum rule #3. Topics involving the exchange of money should be kept only to the Black Market or White Market.
Sales of goods or services should be done in the black market, or white market.
JR
https://groupdiy.com/threads/groupdiy-rules-read-before-posting-in-any-of-the-forums.6650/
Sales of goods or services should be done in the black market, or white market.
JR
https://groupdiy.com/threads/groupdiy-rules-read-before-posting-in-any-of-the-forums.6650/
Thanks John. I've never done this before, so I'm in new territory.
I'll start a Black Market thread (I'm not a commercial operation and I'm offering these at cost, so I don't think a WM thread is right for me). I'll link it in the first post of this thread. Anyone who has reached out or posted here to express interest prior to this post, you are already on my list. Anyone looking to add themselves to the list after this post can do so in the Black Market thread!
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nielsk
Well-known member
Can I get a list of the UTM parts required so I can inquire about a quantity purchase from them for a potential group US purchase?
Thanks!
Thanks!
Sure!
Input Transformer - UTM2571
Inductors - UTM1543 & UTM1544
The output transformer is where we'll need to make a decision, particularly for US-based builders. I created the project to use the Cinemag CMOB-3S, and that's what I used in my build. It's high quality, inexpensive (when I built mine, they cost a bit less than the UTM), sounds great, and for those of us in the States, doesn't incur a ton of additional shipping costs nor customs/duty fees. On the other hand, Herbert contacted Igor at UTM and asked him to wind his UTM3523LP for 600:600 (the LP stands for "low profile" and is important, the regular 3523 is too large for the 500 series). The bobbin on the UTM is apparently larger than the Cinemag and Herbert had to file out the PCB a bit, so I have adjusted the cut-out for the bobbin on the board based on his estimates - UTM does not provide the dimension in question on their datasheet. It should be just fine to use either transformer now, although I want to make the disclaimer that if we go with UTM and my adjustments to the board were still not sufficient, we may need to do a little filing to the PCB (not the end of the world).
So with that, it's either 3 or 4 pieces from UTM, bearing in mind that if the output transformer comes from them, you'll need to email Igor about the custom winding.
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nielsk
Well-known member
Thanks!
Are there any other parts that will have to be obtained from outside the US?
I will start a thread for a parts group buy to see if there is enough interest to make it happen, and hopefully get some quantity pricing.
I am looking forward to trying this EQ!
Are there any other parts that will have to be obtained from outside the US?
I will start a thread for a parts group buy to see if there is enough interest to make it happen, and hopefully get some quantity pricing.
I am looking forward to trying this EQ!
The only other parts that would come from outside the US would be the front panel, L bracket, and small 90° angle bracket from Frank.
MidnightArrakis
Well-known member
Either provide me with these mechanical dimensions or point me in a direction with a link that has them and I could easily create these 3 items myself, along with low-cost sheet metal shops to have them fabricated here in the U.S. There should be no reason to have to purchase something as simple as these items are from a foreign country 4- or 5,000-miles away!!!
/
Hey @JMan have you compared the Redd to a 69 eq both being inductor based one has to be sweeter than the other. Maybe @HerbertR could chime in? I would be tempeted to get some boards but, I already have some Type 69 500's from IJR, and I bought some of Ian's Redd brilliance filter boards already to insert into redd47 preamps when I get to those. Unit looks impressive nice work on sharing a project with the community.
Hey Bobby, thanks for your kind words! I haven't compared the two, as I don't have a 69 myself. I bet Herbert does, maybe he can comment.
JaseSanderson
New member
- Joined
- Jan 15, 2018
- Messages
- 4
I'd love 2 boards please JMan 
Thanks
Thanksjohn12ax7
Well-known member
One thing to keep in mind is that edge connector fingers are typically hard gold, not enig which is too soft for repeated plugging and unplugging.
Hard gold can add significant cost, it's perhaps debatable whether the cost is worth it for a diy project. But just thought I'd mention it.
Hard gold can add significant cost, it's perhaps debatable whether the cost is worth it for a diy project. But just thought I'd mention it.
I should have been clearer in what I said earlier. I'll have the main board done in ENIG *with* gold fingers. The manufacturer can't do gold plating over HASL (I'm sure there is a technical reason that is over my head), which is why I made that distinction. But yes, thank you for pointing out that clarification -- the main PCB that connects to the backplane of the 500 chassis will have gold plating.
john12ax7
Well-known member
Ahh sorry I misunderstood the earlier post. I think enig and hard gold both utilize nickel, so that might be the reason.
Hi Everyone,
I've been posting in the Black Market thread as orders have been coming in so that I am being sure not to break any forum rules. However, there are a few things that I want to put here as well for anyone who isn't watching that thread.
I'll be reaching out to all of you who have requested boards within the next day or two to start collecting shipping information and working out payments.
2 quick notes that I'd like to add in case folks are beginning to think about ordering metalwork and magnetics:
While the board has been modified to accommodate both the Cinemag and UTM output transformers, the L bracket from Frank needs a small modification to one hole if using the UTM. This will be detailed in the build documents, but I'm also working on finding a solution that nullifies any need to worry about this at all, so please stay tuned. For the moment, be aware that if you are ordering the stock L bracket that is currently in Frank's shop, it will only properly fit the Cinemag (though Herbert did find a clever solution for his units, so UTM is not impossible with this).
USA builders, member @nielsk is organizing a group buy for some of the bigger pieces required for the build, and this is a good chance to get those parts at a price break. The more folks we can get to join in, the better the price break, so I encourage you to take advantage of this. See his thread here.
I've been posting in the Black Market thread as orders have been coming in so that I am being sure not to break any forum rules. However, there are a few things that I want to put here as well for anyone who isn't watching that thread.
I'll be reaching out to all of you who have requested boards within the next day or two to start collecting shipping information and working out payments.
2 quick notes that I'd like to add in case folks are beginning to think about ordering metalwork and magnetics:
While the board has been modified to accommodate both the Cinemag and UTM output transformers, the L bracket from Frank needs a small modification to one hole if using the UTM. This will be detailed in the build documents, but I'm also working on finding a solution that nullifies any need to worry about this at all, so please stay tuned. For the moment, be aware that if you are ordering the stock L bracket that is currently in Frank's shop, it will only properly fit the Cinemag (though Herbert did find a clever solution for his units, so UTM is not impossible with this).
USA builders, member @nielsk is organizing a group buy for some of the bigger pieces required for the build, and this is a good chance to get those parts at a price break. The more folks we can get to join in, the better the price break, so I encourage you to take advantage of this. See his thread here.
