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WATCH RELATED VIDEO: Klipsch Cornwall 3's recorded with Tascam Mic Dynaco ST120 tube amp

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David, aka Grumpy, needs our help. Great news. David is home! It was quite the ordeal to get him home and into the house, but it is done. Thank you to everyone for their support. Now a long road ahead to get him back on his feet and functioning normally. I have started a GoFundMe to help with the medical bills. Please help, if you can. Discussion in ' Tube Audio ' started by sloober , Nov 24, Log in or Sign up.

Messages: 3, Location: NC. I am trying to talk my brother in law into a tube amp. We found a ST and he is considering it. I think it is the Nautilus or something.

So he asked if it could be bridged. I had no idea. In fact I don't even know if it can be done with a tube amp. Messages: 10, What is the sensetivity db ratings of his speakers? I have a 50 watt tube amp which pushes a pair of 91db speakers just awsome.

I haven't done this yet, but I think you can bridge a stereo tube amp to mono by connecting the two speaker outputs together. Ask Tinkerbell christine to show you a schematic of a bogen AO This beast uses eight tubes and two 12AX7 tubes, and has two output transformers wired together in parallel for twice the mono output power. I believe you can seperate the circuit of this mono amplifier to make two seperate watt stereo channels, so why not the reverse?

Last edited: Nov 24, I think they are 90dB sensitive. That's the same as my Klipsch KG1 speakers and I drive them plenty loud with my c. Excerpt from Stereo 70 Manual attached. JonL , Nov 24, Messages: 2, Location: San Antonio, Texas. It's not as "bridge" per se, just a paralleling of the two halves of the amplifier Bridging usually implies inverting one channel of the amplifier, usually by splitting the phase of the input signal, and then tying the output grounds together and letting the two positive speaker connections become the positive and negative from the inverted phase that feeds your speaker RickB , Nov 24, So you can parallel the outputs!

Thank you JonL This isn't my thread! Sorry John. Great, I guess it can be done. But it does still increase the power, right? I'm thinking it will work with one unit, but if he thinks it won't be enough he should go bigger. An MC would be a good choice. Messages: 46, Location: LoTL. Messages: 8, Location: Seattle. Technically, a mono ST70 uses one input to drive both channels simultaneously while the outputs are parallelled so it's not really bridging.

Best performance in mono mode requires that the gain of both channels be matched as exactly as possible. Even after all this, some will say that a parallelled pair of amps won't sound as good as each amp does individually. Personally, I can't tell much difference. OTOH, all else equal, I'd opt for a bigger amp if more power was the real issue.

Steve O , Nov 25, Thanks all. I will let him know. Messages: Bluelobster , Nov 25, There are a few tube amps out there that can be bridged paralleled quite easily by means of a provided switch. Any tube amp can be wired up to produce a mono output. As previously mentioned it helps if the channels are matched closely so that one channel with higher gain won't try to drive both the speaker and the other channel. I've been doing this for a few years and there is a difference in sound. The new Primaluna 70 mono amp does the same thing.

The designer felt that scaling up the output transformer to deal with the extra power would compromise the sound so he just tied the 2 channels together with a special circut that reduces distortion. I've never seen a distorton spec generated with a paralled channel amp, and haven't heard of one blowing up either.

Also, you're only going to get 3db more volume after the change which isn't much. Messages: Location: North Florida. Messages: 9, Location: RIP Well, I have a different question.

Perhaps it should be a try and verify. I do have a friend who seems to have a 30 watt threshold and no end of SET systems have passed in and out of his doors. Hey, I'm just askin'. You must log in or sign up to reply here. Show Ignored Content. Share This Page Tweet.

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Review and Measurements of Dynaco ST 70

Read times. Pages: [ 1 ] 2 3 Go Down. But, it wouldn't be the last. The "New Generation Styling" quickly spread to almost every other unit in the Dynaco product line. The brass faceplate FM-1 became the FM

Resolder a few wires in Dynaco's Stereo power amplifier and you're ready for John Free One good way to minimize the heating and cooling needs.

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How it all started and when did DeVore Fidelity enter the high-end audio industry? I was the one with his speakers mounted in the perfect spots, the one who made tapes for everyone. When I got out of school I had a part-time gig as a High End Audio salesman for a dozen years in different stores while pursuing other interests. I continued building speakers through this whole period, and spent countless hours exploring how different speakers and systems and room positions effected the sound in the various shops I worked in. In a friend of mine began selling refurbished vintage tube amps from his Brooklyn apartment and I supplied the speakers. In he opened a true storefront HiFi shop in Manhattan and after refining the product line to two gibbon models, I was in business as a speaker company. Within a year it was my full-time gig and I moved to company to the Brooklyn Navy Yard where our factory remains today. What was the initial reason of pursing the path of high-end audio speaker manufacturer? Before I'd never even seriously considered starting a speaker company.

Can you bridge a Dynaco ST-70

dynaco amp john

John Curl and high bias, thank you. I already realise that, because all the negative informs i had, but seems confused to me, because simulated very good! Simulators cannot inform how some amplifier sounds, but can give us some idea related to square wave response, and those informs are eloquent by itselves. Amplifier to drive a motor is something alike to use its heavy chassis to keep the door openned in a windy day! The Dynaco is completely different, i supposed can be more usefull than to drive motors or hold doors.

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I expect this will be a very interesting tube power amplifier. No price set yet. Dan- Thanks for posting. I remember these in kit form my college days. Dynaco was located in Blackwood, NJ as I recall. There is a place in Clifton, NJ that has replacement parts for older Dynaco equipment.

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My buddy John came for a visit. He's the guy who bought me the SCA80Q and the kits from you. We did some serious listening. The Hafler is over 30 years old, but still sounds great. This is a very well recorded disk arranged by the great Cedar Walton. It sounded great.

Early Dynaco amplifiers were junk but do make nice boat anchors. I agree with John Curl! a ST is not good for audio! Yuck!

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Dynaco Owner's Manuals - with Schematics - in Acrobat format. Stereo 80 Power Amplifier. Stereo Power Amplifier. PAS-4 Preamplifier.

Amazingly, its clear, three-dimensional sound is comparable to many amplifiers made today.

Need support, you got it. Or share your ideas and experiences. Dynaco-Doctor Forum Welcome! Return to Dynaco-Doctor Forum. I had the original st70 amp with driver tube which i liked but it sounded to warm and tubey to my ears.

Data Room. Many music lovers wanted to build their own hi-fi sets because factory built equipment was expensive. Some audio enthusiasts opted to scratch build their equipment using circuits from published articles in Audio magazine or Radio-Electronics.




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