Capacitors [message #30526] |
Mon, 14 February 2005 16:13 |
Manualblock
Messages: 4973 Registered: May 2009
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Illuminati (13th Degree) |
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I pulled the caps out of the box like a sixpac of Bud. Man these things are huge. And the transformer, you really don't get a sense of the size of these things from the pics. I feel like I am in Bedrock, with Fred and Barney. This will be one extra pre-amp el grande. Bought some steel I-Beam to hold 'em up.
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Re: Capacitors [message #30527 is a reply to message #30526] |
Mon, 14 February 2005 16:56 |
colinhester
Messages: 1349 Registered: May 2009 Location: NE Arkansas
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Illuminati (3rd Degree) |
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There's going to be a lot of weight when things are done - that's for sure. I'm using an L-channel under the chassis. This will be placed in under the front mounting holes of botn Tx's and the choke, thus fewer scwers poking through the top (thanks GarMan). Have you started to lay out the CCS? I ran into a concern last night the way I have things on the PC board. The output to the coupling cap and the power (B+ from MOSFETs) are pretty close together, about 1/2". I'm hopeing I'm not going to run into any problems with noise. I think this is where the shielded cable is really going to come in handy......Colin
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Re: Capacitors [message #30531 is a reply to message #30529] |
Mon, 14 February 2005 17:44 |
colinhester
Messages: 1349 Registered: May 2009 Location: NE Arkansas
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Illuminati (3rd Degree) |
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Damir's photo was invaluable in putting together the CCS. Keep it handy. PC board is not the correct term. I used the plastic breadboards, the ones with lots of holes. You can get them at Rat Shack for a couple of bucks. I got the LED from Parts Express. Rated at 1.7V and 20mA. The L-beam has the 5687 heater parts and the CCS bread board. RCA ins and outs will be mounted on the top plate ala Forepaly. I'm having a bitch of a time placing all three caps under the hood. I wanted to mount the PS cap through a hole and out the top, but I decided against it. I think this is something I'm going to regreat later on. My hook-up and bus wires were sent to day, so I should be up and running by the weekend (now there's some famous last words!) What do you think of the new Tx? Now you can imagine my surprise when I picked my box up expecting only one to be in there. The spare Heyboer is sitting here. I'll hang on to it for as long as you like - no rush AT ALL........Colin
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Re: Capacitors [message #30542 is a reply to message #30540] |
Tue, 15 February 2005 07:26 |
PakProtector
Messages: 935 Registered: May 2009
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Illuminati (2nd Degree) |
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Hey-Hey!!!, ON the peanut tubes, the 5687 is the same size as an AU7/AT7/AX7 ( heh-heh-heh...).There is one more thing y'all may want to do. Prepare for adding a second 9-pin socket so that you can run the 12B4 with its lower gain. The mods are simple: 6 LED's instead of two. and of course the second socket. Heater current for two at 12.6 is .6A instead of .45 for the 5687. Minor tweaks of the supply *MIGHT* be required if you want to hit the heater voltage +/- 1% regards, Douglas
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LED's [message #30556 is a reply to message #30554] |
Tue, 15 February 2005 16:40 |
PakProtector
Messages: 935 Registered: May 2009
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Illuminati (2nd Degree) |
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I take a strip of vector board about 5 holes wide and a few inches long for mounting them. Put them in series, and join the proper end to ground and put the other on the cathodes. Please refer to Damir's drawing, I have to look closely at a built up one before I solder a new string together. It is basically long leg to short, but I can't remember if the long or the short goes to the cathode( and the other to ground ). regards, Douglas
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