sbelyo

Not that I can tell. But it sure looks like it did.

I decided to recase my original dynahi. I wired the ac inlet, then hooked up the transformer primaries (Avel Lindberg transformer) gray and bown wires went to hot, blue and violet went to neutral. I got correct voltage on the primaries and secondaries when I threw the power switch. I mounted the original psu in the case. This is the board http://gilmore.chem.northwestern.edu/dynahipsbig.bmp I connected one pair of secondary wires to AC1 and the other pair to AC2. The order went 1 to orange, 2 to yellow, 3 to black, 4 to red. I threw the switch and the fuse blew. Now the transformer primaries and secondaries are shorted when checked with a meter out of the circuit. What mistake did I make? And did I damage the PSU. How can I check it?

thanks

Are we able to search within a thread? If not I suggest that.

I'm thinking of using a Twisted Pear Joshua Tree attenuator to control the volume. Do you guys think it will work ok? I have the off board heatsink version of the Dynahi. Here's the description: http://www.twistedpearaudio.com/control/jt.aspx Joshua Tree is a logarithmic stepped attenuator with 128 steps + mute. It utilizes eight Omron G6K relays and can be setup for any degree of attenuation per step and any total amount of attenuation. The kit uses Vishay/Dale 1% CMF resistors, providing 0dB to -63.5dB of attenutation (+ mute) in .5dB steps. The kit's input impedance varies between 2.2K and 10K, with a fixed output impedance of 750R Do you guys think this will be ok to use?

I thought I read somewhere the over-sizing your transformer is not recommend because something happens with the magnetic field that induces hum. However, I'm sure the wiring is not optimal at all. That is one of the reasons I'm putting it in a new case. My guess is that fixing the wiring and shielding the transformer should stop the hum.

Thanks... Looks like I'm over-sized. So reducing to 100 or 80VA would help reduce the hum correct?

I built my original Dynahi 8 years ago and I'm going to re-case it to match my other builds and to fix some hum because the transformer is in the same case. I built a stereo version with two one channel boards powered by one PSU. I do not remember how I arrived at the value of the transformer I have now but I think it's 160 VA. The original BOM for the PSU says 250VA. Should I go up to the 250 VA spec'd in the BOM? Or is the 160 VA enough? I was thinking of trying to reduce the size of the transformer because of the hum but now I see I may have undersized it.

The green dot was the + side No dot was - These drivers are really good. I only have them running for 90 minutes with stock SR60 grills and pads and they sound pretty accurate. Now to mod some grills and try different pads.

What's the polarity of the Turbulent Labs driver? Is the green dot + or - ?

Thanks... I think I wanna get them but I'd have to sell my Joe Grado SR-200

I thought I might see what they're all about. What do you all think is a fair price for a pair in excellent shape?

Here's some possible lyrics and the link to that thread The best thing in life is not to have to worry I'd rather be cool than have all that money http://www.allthelyrics.com/forum/showthread.php?t=133714

I did successfully remove two drivers from their housings without damaging the plastic housing. Of course the drivers came out in pieces but I had no intentions of saving them as they were bad I tried two ways. first way was drilling 1/8" holes from the back side around the perimeter of the driver. Then you flip it over and work a small screw driver into the holes. They pry up against the outside rim of the shell and the glue breaks loose. I did have to work at it a bit but it comes out. second way was cleaner but more time consuming. Took a small 1/8" router bit and chucked it up in a dremel. At slow speed go around the perimeter of the driver from the top and mill away the plastic all the way around. Then from the back just work at it with a screw driver and light taps from a hammer Both ways required a little clean up to get the small pieces and a few small gouges left by the screw driver

YES, that is the song !!!! who sings that?

I need help identifying a song in Cheech & Chongs next movie. When Chong and Red (Cheech) leave the record store and jump in the Jag driven by Gloria (Riki Marin) it pulls into the driveway of a nice mansion. What is the song that is playing in the car when it pulls in?

I'm definitely game to try. I'll try heat at first. As far as the solvent goes I have some grado plastic I can test it on. Always loved mega man

Is it possible to remove a grado driver and leave the cup intact? I want to remove some drivers from their plastic housings without cutting up the housing. I watched the grado assembly video on their site and they just pop in the front and are secured with a little CA I'm guessing. My though was to cut out as much of the driver as I could, then soak it face down in acetone. What do you think?

Thanks, they look kinda dense. That's a great pic by the way, how did that actually sound?

Has anyone tried the Grado replacement pads from ebay? The ones that ship from China with the hole in the center.

I'm sure it's my ears lying. I probably should have payed more attention. 10K was the recomended value so I'll leave it at that based on what nikongod says. I think maybe I should lower the gain if the volume gets too high too fast correct?

My original Dynahi built in 2008 is still going strong and sounds just a good as they day I finished it. I replaced the 50K volume pot with a 10K as it should've been years ago. I believe KG said 50 was to high. With the 10K the amp sounds perfect but I think I've lost the use of the full range of the volume control. I only use the first 25% now where I used to use up to 50% or more with the 50K. Do you think it would be ok to switch to a 25K volume pot?

Does it slip when you turn it? I'm using it to turn the shaft of a volume control and goldpoint switch. The knob will be collet mount and the shaft coupler is a clamping style

Bingo, thats the one

yeah, those might work