Dynaco parts quality
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Category: Dynaco 470
I first owned one of these vintage solid-state preamplifiers back in and the sound, even with a tube amplifier, was certainly nothing to remember - harsh, flat and very unpleasant with any speaker with a working tweeter. Eventually the whole thing was gutted and used as an experimental op-amp platform! Flash forward twenty years and I'm stuck with a large Ikea Expedit bookcase with 13 by 13 inch slots. Though perfect for holding hundreds of LPs, finding quality small gear that can fit inside has always been a challenge.
The Dynaco line of preamplifers, tuners and integrateds slide right into the slots perfectly, which is one of the reasons I keep coming back to these venerable components. Of course another reason is the easy to get manuals and parts which makes modifications and repairs easy on the wallet. An examination of the schematic reveals a simple single power supply, two transistors for each channel of the phono section and two transistors for each channel of the line section.
Negative feedback is used to control overall gain and lower output impedance as there is no buffer stage to drive the output. This circuitry actually reminds me of the Dynaco PAS and probably came directly out of the transistor manufacturer's specification sheet.
I began to wonder if this old preamplifier could be made good with a few part upgrades, so I decided to tackle upgrading a Dynaco PAT-4 using the AVA Audio Audio Basics starting on page 29 as my basic guideline. I soon found a nice looking PAT on Ebay for an absurdly low price and upon arrival was greeted by a fairly mint specimen. I hooked it up to my McIntosh and was not impressed by the results.
The PAT-4 was as harsh and grainy as I remembered it, plus one of the phono channels was weaker than the other. Could I gain any sonic improvements by replacing the ancient capacitors and bypassing the touchy tone controls? Let's find out. Cracking open the PAT-4 revealed a bevy of leaking electrolytic coupling capacitors and even two connections that were missed by the solder iron of the original kit builder.
This is also a good time to replace the four small electrolytic capacitors located near the front input jack and back tape outs with wire. With the tone control bypass, I also figured out a clever way of removing one of the large coupling capacitors from the signal path while keeping the emitter bias dc voltage out of the signal output. See image below for the tone control bypass instructions and the capacitor upgrade locations. As far as parts quality, this is a budget rebuild so I shied away from the ultra-expensive tweak parts.
Instead, standard Digikey parts were used except for the four 10uF Polyester signal and Nichicon Muse power supply capacitors I found cheaper on Ebay. Replacing the components on the PCB boards is easier if the metal brackets are gently bent to a 90 degree angle. The power supply was next. I originally envisioned a LM regulator, but feared the original transformer could not handle the extra current demands. Dynaco built everything to a price point and I wasn't sure if the transformer would overheat.
Since this is a budget build anyways, I decided on just improving the basic unregulated supply with the use of slightly more capacitance and better parts. A more intrepid builder could remove the original transformer, use an outboard SMPS supply that feeds an onboard regulator using a LM or whatever. The sound wasn't half-bad.
A little lacking in 'color' and drama, the signal was clean and certainly listenable. It vaguely reminded me of an old Adcom preamplifier, but my memory of that unit is fairly sketchy, rendering any comparison fruitless.
Paired with the McIntosh MC , this could have been a fairly common solid-state system back in ! The sound was certainly different than the previous preamplifier as this classic all solid-state combination was faster and had deeper bass. The new sound is now quite modern and the phono stage is also extremely quiet without any channel imbalance. The refurbished Dynaco PAT-4 is now a nice little budget preamplifier and would be an inexpensive project for anyone handy with a soldering iron.
Your results may vary depending on the new parts used and the overall condition of the stock unit. I don't know, but a few more hours on this preamplifier and it has really smoothed out. Most of the glare is gone and I'm quite pleased with the end results. With new parts and the tone control bypass, it is a screaming deal for the little time and money put into it. The phono stage is dead quiet and the linestage is very quick and dynamic.
Music is tons of fun to listen to with good detail, deep bass and snappy transients. Not bad for something that's normally considered a vintage piece best forgotten. Email This BlogThis! Labels: Dynaco PAT-4 preamp preamplifier upgrade refurbishment review. Newer Post Older Post Home.
All vintage USA audio 1930s ~ 1980s
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Dynaco Stereo 70 ST-70 tube amplifier
Discussion in ' Audio Hardware ' started by Radiotron , Sep 9, Log in or Sign up. Steve Hoffman Music Forums. Location: Montreal, Canada. What model is this? What would be a fair price if it's been totally rebuilt. Radiotron , Sep 9, Location: Colorado. Looks to me like a homebrew amp using Dynaco iron. Do you know what the tube complement is?
DYNACO SPARE PARTS. Spare part category: M2
The EXTC Stereo allows you to connect guitar effects pedals to the inputs and outputs of pro audio equipment such as recording interfaces and mixing consoles, so you can incorporate stereo pedals into your recordings and explore new creative possibilities. The JX42 V2 offers professional guitar and amp switching for any touring act, with the ability to handle up to four instruments and two amplifiers simultaneously, along with premium components for incredible audio quality and remote connectivity that accommodates Radial footswitches and MIDI controllers. The Power-1 is clean power filtering unit in a rugged rackmount enclosure, providing anyone with valuable electronic gear and audio equipment with superior filtering against interference along with peace-of-mind surge protection. The HDI is a studio-quality direct box designed to create exceptional recordings with any instrument, utilizing premium Jensen transformers and a unique Color control that provides an entirely new yet familiar-sounding sonic palette to experiment with. The J48 stereo is a high performance 2-channel active direct box for live concert touring and professional recording studio applications, with the ability to handle extreme transients without distortion while delivering the natural sound of your instrument.
Dynaco ST-70 PC-3 driver board parts layout - photo ...
Cash and Carry Thanks. Both are two channel. Free shipping. Location: Dallas, Tx. Perhaps the Adcom would do better with some amp I didn't try, but I tried this with two Rotel 's strapped mono, an Audire Crescendo, and the Hafler Published on Art.
Hydraulic tipping valve
As a veteran audio electronics engineer I welcomed the news that Radial Engineering had acquired the Dynaco intellectual property and brand. I was one of the last engineers that received basic electronics education on tubes back in the s. I used to repair and rebuild Dynaco products back in the s. Though I worked for many years on Class-D PWM amplifiers, DSPs, digital audio distribution and other state of the art technology on the leading edge, I immediately jumped on the opportunity to spearhead the introduction of the Dynaco product line and develop the next generation ST, something I really wanted to do. How hard could it be to bring this legend back to life considering we already had schematics and sample amplifiers to measure? Well, it turns out this is a lot harder to do than one would expect. For example, the Dynaco output transformers are magic when it comes to high frequency clarity, yet truly accurate build information is not to be had.
We assume that all the transformers in your existing ST are in working order. Dynaco had two types of PA power transformers they used. This is the size transformer we are using in our test ST and we've had NO issues with using this size.
I bought it from the 2nd owner who had purchased it used in Alexandria, Va. It sounds like it was intended for a New Years Eve party that night! It powered up fine and the tubes biased correctly. But when I saw the circuit board with ancient caps and grungy resistors I decided those parts had to go.
August World Premiere Review! Review By Jeremy R. T here are some pinnacle names that simply standout in history, even that of high end stereo music playback. Take the Dyna Corporation, which was founded in Philadelphia back in October by none other than legendary audio inventor David Hafler and his colleague Ed Laurent. Although they began by designing and creating high quality transformers that also happened to work well for musical instrument gear, their true interest was in making high end audio components available at affordable prices to the masses.
The Audio Voice Newsletter. Show more 8. Show less. Following a preview at the High End show, in Munich, the relaunch of the Dynaco ST Series 3 tube amplifier is now confirmed for Spring , with the official launch already scheduled for High End
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