Hello All,
I have finally gotten around to building the SPP that I have been asking about for a while.
I will be building EL84 Style on this example.
So far I have the boards mostly stuffed.
I went with Dale RN & CFP Resistors, Sprague 716P's, Elna SILMIC II's for the LV electro's and Nippon & Panny's for my HV electro's.
I will be using the Triad C-14X choke instead of the 150Ω resistor.
I would like to go SS rectification on this one and I had a question, should I go with 300-0-300 or 275-0-275 since I won't have the tube rectifier drop?
I have finally gotten around to building the SPP that I have been asking about for a while.
I will be building EL84 Style on this example.
So far I have the boards mostly stuffed.
I went with Dale RN & CFP Resistors, Sprague 716P's, Elna SILMIC II's for the LV electro's and Nippon & Panny's for my HV electro's.
I will be using the Triad C-14X choke instead of the 150Ω resistor.
I would like to go SS rectification on this one and I had a question, should I go with 300-0-300 or 275-0-275 since I won't have the tube rectifier drop?
Attachments
Well.....My tubes have arrived.
I picked up a matched quad of EL84's and a matched pair of 12AT7's.
6L6 traded me some parts for a Hammond 272JX so I decided to stick with tube rectification.
My Triad C-14X 6H 200mA choke will show up tomorrow.
My next order from Mouser I will pick up a 60uF Motor Run cap and the last of misc. parts.
I am moving to a new house tomorrow and my progress on this project will be slow as a result, but since I have all the parts except for the output iron there will be progress finally.
I picked up a matched quad of EL84's and a matched pair of 12AT7's.
6L6 traded me some parts for a Hammond 272JX so I decided to stick with tube rectification.
My Triad C-14X 6H 200mA choke will show up tomorrow.
My next order from Mouser I will pick up a 60uF Motor Run cap and the last of misc. parts.
I am moving to a new house tomorrow and my progress on this project will be slow as a result, but since I have all the parts except for the output iron there will be progress finally.
Attachments
They do look like nice sockets. Any chance you can return them for a refund?
You really want the ones with the bent tabs for PCB mount, like these:
http://www.partsconnexion.com/CONNEX-73283.html
jeff
You really want the ones with the bent tabs for PCB mount, like these:
http://www.partsconnexion.com/CONNEX-73283.html
jeff
Boards are complete and I will be going with a 6H 150Ω 200mA choke.
I'm still debating on a Motor Run Cap or not, Would THIS one be suitable?
Would there be any benefit to paralleling 3 of these to get 135uF and just leave out the stock 150uF, or would it be better to parallel one of the MR Caps with a 100uF Electrolytic?
The 272JX will be wonderful, IT IS HUGE & I won't even really push it that hard with this amp.
My Edcor CXPP25-MS-8K OPT's have been on order for about 3 weeks now so there is not much longer to wait on them.
I will probably be doing a Hickory or a Mahogany chassis with .100" Aircraft Aluminum top, I have plenty of wood in my pile and I have found a good supplier for aluminum sheet stock.
I'm still debating on a Motor Run Cap or not, Would THIS one be suitable?
Would there be any benefit to paralleling 3 of these to get 135uF and just leave out the stock 150uF, or would it be better to parallel one of the MR Caps with a 100uF Electrolytic?
The 272JX will be wonderful, IT IS HUGE & I won't even really push it that hard with this amp.
My Edcor CXPP25-MS-8K OPT's have been on order for about 3 weeks now so there is not much longer to wait on them.
I will probably be doing a Hickory or a Mahogany chassis with .100" Aircraft Aluminum top, I have plenty of wood in my pile and I have found a good supplier for aluminum sheet stock.
Attachments
If you search the forum, you should find a builder who made an SSE using all motor run caps. So yes, it can be done. These caps are quite large, though, and the law of diminishing returns quickly apply.
I don't have a motor run cap on my SPP, but I will probably stick one in there at some point. It looks like you have a Nichicon capacitor in that position, which is a decent part to begin with. The one you have chosen will work fine. Keep in mind that you can use a 370VAC capacitor as well. They can handle upwards of 500VDC. Here is one that is only slightly larger but gives you more capacitance:
Surplus Center - 60 MFD 370 VAC MOTOR RUN CAPACITOR
I don't have a motor run cap on my SPP, but I will probably stick one in there at some point. It looks like you have a Nichicon capacitor in that position, which is a decent part to begin with. The one you have chosen will work fine. Keep in mind that you can use a 370VAC capacitor as well. They can handle upwards of 500VDC. Here is one that is only slightly larger but gives you more capacitance:
Surplus Center - 60 MFD 370 VAC MOTOR RUN CAPACITOR
WOOOT! My OPT's from Edcor shipped today.
19 day turn around!
Temco has a 100uF 440V for $15.50 w/ free shipping on Ebay, I have some 47uF 450V snap ins in my parts bin.
The cap I have there is a Nippon Chemi-Con in that position, all parts have come from Mouser and other reputable sources.
19 day turn around!
Temco has a 100uF 440V for $15.50 w/ free shipping on Ebay, I have some 47uF 450V snap ins in my parts bin.
The cap I have there is a Nippon Chemi-Con in that position, all parts have come from Mouser and other reputable sources.
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