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Post by Deleted on May 10, 2020 13:15:38 GMT
I’ll stick some pictures up as and when they’re needed but nothing much has happened as yet.... I’m going for a two box build to get the transformer away from the PCB but mainly as I wanted to keep the main box width down so it sat on my shelf better. I’m building it in Olive wood so it matches my preamp as below:  Transformer is on order from Tiger Toroids. Majority of components would be on order from Farnell if it would accept the PayPal payment - message out to their sales team on that one..... Will get round to ordering the 2 valves from Watford ASAP, I have a 12ax7 I can try already..... That just leaves the two caps C7 and C8 I think and at the moment I’m tossing and turning between the Vishays Oli uses, Jantzen Silver Z-Caps and Mundorf Mcap Supreme. I think that’s it for now so comments welcome...... |
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Post by electronumpty on May 10, 2020 14:09:28 GMT
I used Mundorf EVOs silver gold oil in mine, sounds very sweet and still more to come I think. Also some Mlytic Ags for power duties but these had to be mounted off board. Don't know how these sound compared to the BOM caps but I am very happy with the results. Recently tried a 6N2P in mine instead of the ECC83, these are very cheap on Ebay (£6) and sounds really good.  |
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Post by Deleted on May 10, 2020 14:12:59 GMT
Thanks for that, will have a look at these too
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Post by Deleted on May 13, 2020 14:06:54 GMT
Ok, most of my bits have arrived, another delivery later today will complete things apart from valves......
Need to start populating.....
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Post by Deleted on May 16, 2020 16:54:49 GMT
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Post by electronumpty on May 16, 2020 17:10:40 GMT
Nice case there!
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Post by gninnam on May 16, 2020 17:10:41 GMT
Liking the wooden chassis |
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Bigman80
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Post by Bigman80 on May 16, 2020 17:29:58 GMT
I wish I had the wood working skills to do that |
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Post by nuff on May 16, 2020 17:39:59 GMT
Very nice grain. What’s the timber. |
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Post by Deleted on May 16, 2020 17:42:25 GMT
Oh I can’t take credit for the woodwork although if I put my mind to it I probably could. My woodworking is probably as rusty as my electronics so resurrecting one of those was sufficient. Ant at BTE is making the case for me.
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Post by Deleted on May 16, 2020 17:46:04 GMT
Very nice grain. What’s the timer. Thanks, it’s olive. |
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Post by firebottle on May 16, 2020 17:57:23 GMT
Gorgeous wood. Make sure you have some ventilation.
What are you using for top and bottom?
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Post by nuff on May 16, 2020 17:58:19 GMT
Very nice grain. What’s the timer. Thanks, it’s olive. Very nice. Will look very nice when oiled. |
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Post by firebottle on May 16, 2020 17:59:01 GMT
Very nice grain. What’s the timer. About 3 weeks? |
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Post by nuff on May 16, 2020 18:04:03 GMT
Very nice grain. What’s the timer. About 3 weeks?  edited, cheers Alan  |
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Post by Deleted on May 16, 2020 18:07:07 GMT
Gorgeous wood. Make sure you have some ventilation. What are you using for top and bottom? It’s 3mm plate for the bottom and will be drilled once I’ve positioned the board etc. Top is acrylic and at the moment is having 3 sets of front to rear pair of 3mm holes if that makes sense. Left, right and centre pairs of holes front to back might be a better description..... |
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Post by Deleted on May 16, 2020 18:07:40 GMT
I wasn’t rude enough to to mention it |
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Bigman80
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Post by Bigman80 on May 16, 2020 19:20:01 GMT
Made a start....  Sorry, only just noticed the pic of the PCB, due to my attention being drawn to the wood! Those Green LEDs could do with being yellow or red. I thought i had changed that in the BOM? I will double check |
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Post by Deleted on May 16, 2020 20:07:07 GMT
Funny you should mention that as I just put the part number into farnell and took what came up. It wasn’t until I saw another board today that I wondered about whether I had the correct value.....
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Post by Deleted on May 17, 2020 10:12:59 GMT
Sorry, only just noticed the pic of the PCB, due to my attention being drawn to the wood! Those Green LEDs could do with being yellow or red. I thought i had changed that in the BOM? I will double check Yeah just checked and there wasn't a part number in fact but it did say any colour lol. Assuming it's about 2v that we have here then but what current so I can get the right one? Going to order the updated resistors so will add these too. Anything else in the pipeline I can add? |
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Bigman80
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Post by Bigman80 on May 17, 2020 11:12:33 GMT
Sorry, only just noticed the pic of the PCB, due to my attention being drawn to the wood! Those Green LEDs could do with being yellow or red. I thought i had changed that in the BOM? I will double check Yeah just checked and there wasn't a part number in fact but it did say any colour lol. Assuming it's about 2v that we have here then but what current so I can get the right one? Going to order the updated resistors so will add these too. Anything else in the pipeline I can add? Haha Only the fet boards tbf. My attention will be shifting from developing the Bigbottle over the next few weeks as I have other projects I want to play with, so advancements are unlikely, unless Alan or the DIY community come up with something... Oh!, I have bought an Ultra low noise replacement for the 7805, just to see if it does anything but it is a cheap Chinese one. It worked wondered In the Weilang preamp, so thought it might hold some benefit here. I'll share a link, but if I'm honest, I wish I'd gone for something a bit more elaborate looking.....and costing about £30, as I know if this does do anything, I'll be spending on a posh one. |
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Bigman80
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Post by Bigman80 on May 17, 2020 11:16:17 GMT
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Post by Deleted on May 17, 2020 11:23:24 GMT
That's a lovely piece of Olivewood that the case is made from. One of my favourite light coloured timbers.
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Post by Deleted on May 17, 2020 11:32:08 GMT
That's a lovely piece of Olivewood that the case is made from. One of my favourite light coloured timbers. Thanks it's been a favourite of mine since I got my AN speakers in the same wood. |
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Post by electronumpty on May 17, 2020 13:34:48 GMT
Interesting what voltage would you need it for? I see HiFi Collective do some more expensive ones. |
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Post by Deleted on May 17, 2020 13:51:15 GMT
Bit more progress....  |
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Bigman80
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Post by Bigman80 on May 17, 2020 14:15:15 GMT
Bit more progress.... Looking great!! I like a tidy build |
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Post by Deleted on May 17, 2020 14:20:01 GMT
Thanks, did you see my other post regarding the LEDs? I wondered about current rating but assume a "normal" 20mA is fine for them as I have options at Farnell?
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Bigman80
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Post by Bigman80 on May 17, 2020 14:24:10 GMT
Thanks, did you see my other post regarding the LEDs? I wondered about current rating but assume a "normal" 20mA is fine for them as I have options at Farnell? Oooh, sorry. It's the forward voltage that is an issue apparently. Everything will be ok with green but the valves will be biased a little high I cant recall exactly what firebottle said?? I'm sure he'll chip in. |
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Post by Deleted on May 17, 2020 14:45:15 GMT
Yeah that's fine and I can knock it back a bit with a yellow or even red but even for yellow LEDs there are different current ratings so I just wanted to make sure my next purchase is correct. I didn't want to go for 20mA and then for Alan to say, nope 10mA is what you want lol
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