You might try the PCA daughterboard someday? Sounds like you may like a bit more H2 (in the 0.05% range vs 0.005% range).
Thanks X for this explanation. I've joined the party late and was wondering the same thing. I will look on Esty to see if there are Mel DBs still available to purchase. I received the Korg 6P1 kit PCBs last week, along with the PCA DBs as a courtesy from you. Thanks! I just sent an order off to Mouser and Digi-key for parts.Hi YOB,
Glad you found this in your perusals.
The Melbourne is indeed similar to Aksa Lender Preamp but dual rail, more importantly, is DC coupled, if you wish. It also has a topology tweak on the output - it has a mu-follower which enables it to drive lower impedance loads at lower distortion. This was needed since the 600ohm Edcor on M2x was quite a difficult load for the regular Aksa Lender. Maybe the HPA version would have faired better - but I needed dual rail to be compatible with M2X.
You can indeed use same awesome PSU from the ppm distortion HPA project. However that’s a 18v supply and the Melbourne likes 24v to 30v dual rail.
It’s got a lot of SMT though so the YARRA is pretty much all TH, which works well for a lot of folks. The use of linear trafos and cap multipliers also makes this PSU one of the best around. It can handle loads in excess of 1A depending on your trafo and diodes.
Jump on in if you want. Get the Melbournes at least and play with them.
Looking forward to the build.
Definitely have more Melbourne’s left. I think it’s one of the best preamps ever made. It’s the same topology as the front end of the Alpha and ABBB amps.
Thanks for the order Redjr!
@X, What's the status on the availability of the Yarra enclosure? Are there any extras, or is another GB for it a possibility?
2.2mfd 63v 5mm WIMA Film Cap
Anyone know of a ready source for these caps. Having a difficult time finding any of them at the big parts houses. (Mouser, Digi-key). They are out of stock at Mouser and won't be back in until, "will advise" 🙁
MKS2C042201K00JO00
2.2 uF 63 VDC 5%
WIMA Film Capacitors
In the meantime I've ordered some from China, but they likely won't show up until Christmas, and may not be authentic! Urgh. It's been my experience, that WIMAs are hard to find caps with 5MM lead spacing.
Is there an equally as good substitute brand for this preamp?
Anyone know of a ready source for these caps. Having a difficult time finding any of them at the big parts houses. (Mouser, Digi-key). They are out of stock at Mouser and won't be back in until, "will advise" 🙁
MKS2C042201K00JO00
2.2 uF 63 VDC 5%
WIMA Film Capacitors
In the meantime I've ordered some from China, but they likely won't show up until Christmas, and may not be authentic! Urgh. It's been my experience, that WIMAs are hard to find caps with 5MM lead spacing.
Is there an equally as good substitute brand for this preamp?
An octopart.com search found only two distributors for those caps, one of whom has a minimum order quantity greater than 1000 pieces. It might be a good idea to widen your search to include different voltage ratings and/or different tolerances and/or different capacitance values and/or different lead spacings and/or different manufacturers.
An octopart.com search found only two distributors for those caps, one of whom has a minimum order quantity greater than 1000 pieces. It might be a good idea to widen your search to include different voltage ratings and/or different tolerances and/or different capacitance values and/or different lead spacings and/or different manufacturers.
Well, the value itself must have been chosen for a reason based on the designer. Also, the daughter boards are fairly well compact with parts, so a different lead spacing and/or voltage rating may not fit properly. I like to use what is specifically called out for in the BOM - within reason. I know, I know my OCB at play here! 🙂
As I mentioned... If there are just as suitable other brands and lines that can compete with the WIMAs, I will make appropriate substitutions.
Min. amount:1050 for MKS2C042201K00JO00 now for 5 you can try Here but 10%Anyone know of a ready source for these caps. Having a difficult time finding any of them at the big parts houses. (Mouser, Digi-key). They are out of stock at Mouser and won't be back in until, "will advise" 🙁
MKS2C042201K00JO00
2.2 uF 63 VDC 5%
WIMA Film Capacitors
In the meantime I've ordered some from China, but they likely won't show up until Christmas, and may not be authentic! Urgh. It's been my experience, that WIMAs are hard to find caps with 5MM lead spacing.
Is there an equally as good substitute brand for this preamp?
Which part is that for? I suspect that’s a signal path cap. In which case some thing like this is fine. 1500 units in stock and ready to ship. $1ea.
MKS2C042201K00JSSD WIMA | Mouser
MKS2C042201K00JSSD WIMA | Mouser
@X, What's the status on the availability of the Yarra enclosure? Are there any extras, or is another GB for it a possibility?
According to Modushop website - there are still some in stock?
YARRA PreAmplifier Chassis
Have you tried placing an order?
Does anyone have a source for proper fitting knobs and a coupling extension shaft for the Modushop chassis?
Which part is that for? I suspect that’s a signal path cap. In which case some thing like this is fine. 1500 units in stock and ready to ship. $1ea.
MKS2C042201K00JSSD WIMA | Mouser
12 used on the PSU board.
According to Modushop website - there are still some in stock?
YARRA PreAmplifier Chassis
Have you tried placing an order?
Just saw it using your link. Thanks. Have not yet ordered. Just wanted to make sure it was still available.
I placed an order for most parts just 2 days ago. Yesterday I got a note from Mouser that they were not in stock. That was fast! Will order today, but have to pay another $9 in shipping.Hi redjr,
Mouser has these in stock:
505-MKS2C042201KJC00
12 used on the PSU board.
Even 50v rated film caps can work here. But the one I linked that is 63v and in stock should work fine.
Those are snubbers so not as critical.
Thanks everyone for the suggestions. I'm sure I'll have more questions about this build along the way, but getting the correct parts is step 1. 🙂
Here is the Mouser shopping cart (revised to include Schurter EIC) and other miscellaneous parts as provided by Vunce:
Project & Cart Sharing | Mouser
X, Would you please re-link the Mouser project BOM for Yarra. The link above doesn't seem to work for me. Is it still active? Is there an access ID required? I'm assuming it's a shared project?
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We will have to ask Vunce to link that. I don’t have that shopping cart. What I used was modified somewhat.
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