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What s in your Hi-Fi?
Posted: Tue Apr 24, 2007 9:52 am
by madlee_Archive
I'm no expert, but that thing looks manufactured to me. what's with the badges on the dials? The extended knobs look like this thing was in a cabinet of some kind. It also kind of looks like one of those amps you find in old movie theaters.
Those NOS tubes also seem to indicate that it is vintage and not a project...who would throw expensive tubes into an untested project?
What s in your Hi-Fi?
Posted: Tue Apr 24, 2007 9:59 am
by madlee_Archive
Brinkman wrote:Madlee,
I built an ST70 myself about three months ago. Of course I got it from the revitalized dynakitparts.com company, as opposed to the authentically vintage Dynaco ST70s from the 60s. The circuit/design is recreated, but the selenium rectifier is replaced with a diode and the transformers are very close approximated to the orignals.
I have upgraded the capacitance with a SDS coupling cap upgrade, and am soldering together a better front-end PC board that I ordered. This whole project is my first foray into DIY electronics and is very gratifiying.
My speakers are Klipsch Fortes that I am to modifiy/recap soon, and I am building a Hagerman BuglePro as my phonostage and a Hagerman Clarinet as a tube-powered line-stage.
My turntable is a ProJect debut.
Shellac's At Action Park is my reference LP.
wow, those are pricey. I bet the kit you bought has much better components than the original ST70.
What s in your Hi-Fi?
Posted: Fri Apr 27, 2007 7:41 pm
by Nina_Archive
What s in your Hi-Fi?
Posted: Sat Apr 28, 2007 10:29 am
by Braden_Archive
Nina wrote:As to sound, I have been warned not to plug it in unless I have it hooked up to speakers, which I have not done. I can do this though. Should I? (Probably a stupid question.)
If you don't know what you're dealing with then powering it up by itself is the only thing to do. If it decides to blow up I'd hate for it to take your speakers along with it!
What s in your Hi-Fi?
Posted: Sat Apr 28, 2007 10:46 am
by Rodabod_Archive
Braden wrote:If you don't know what you're dealing with then powering it up by itself is the only thing to do. If it decides to blow up I'd hate for it to take your speakers along with it!
Powering it up without a speaker load attached will cause the output tubes to fry and may cause damage to the output transformers too. Just plug shitty speakers of the correct impedance in if you are scared.
Roddy
What s in your Hi-Fi?
Posted: Sat Apr 28, 2007 11:07 am
by Braden_Archive
Rodabod wrote:Braden wrote:If you don't know what you're dealing with then powering it up by itself is the only thing to do. If it decides to blow up I'd hate for it to take your speakers along with it!
Powering it up without a speaker load attached will cause the output tubes to fry and may cause damage to the output transformers too. Just plug shitty speakers of the correct impedance in if you are scared.
Roddy
Without an input signal there should be no need for a speaker load. A 100R/2W or higher wattage resistor across the outputs would be enough to prevent any possible damage, but shitty old speakers will work just fine too.
What s in your Hi-Fi?
Posted: Wed May 02, 2007 5:50 am
by JDanger_Archive
M_a_x wrote:I recently got a Rega P1 turntable. Switched the cartridge to a Rega Bias 2 pretty darn quick and got a glass platter, so it's basically a P2. Very happy with it. My amp is a stoopid Pioneer and the next thing to be replaced on my 'get a decent sounding stereo' quest - any suggestions in the 0-500$ price range? I don't know who made my speakers, I think they're homebrewed, but I like 'em.
I've noticed that the platter that was supplied with my Rega P1 is slightly warped possibly. During quiet moments of sustained notes the pitch 'wobbles'. I have ordered the P2 glass platter. Will this fix my problem?
Edited for clarity.
What s in your Hi-Fi?
Posted: Mon May 07, 2007 5:57 pm
by JDanger_Archive
Bump.
What s in your Hi-Fi?
Posted: Mon May 07, 2007 11:35 pm
by Brinkman_Archive
JDanger,
You thought your platter is warped. I'm assuming you detected a "warble". You ordered an aftermarket platter. Are you bumping the thread because you want additional troubleshooting or because this new glass platter did not help your problem?
What s in your Hi-Fi?
Posted: Tue May 08, 2007 5:02 am
by JDanger_Archive
No, the new platter has not yet arrived. To the best of knowledge it will solve my problem, I am just curious to hear if these P1 platters are known to be inefficient, or if anyone has had similar problems. Or if my logic seems sound to those with experience in these matters.
