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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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I am beginning a small tube project, and Hammond transformers came to my attention. Are they any good? I am thinking
Hammond 1650W for output, with 6550's in push-pull.Thank you....
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I am beginning a small tube project, and Hammond transformers came to my attention. Are they any good? I am thinking
Hammond 1650W for output, with 6550's in push-pull.Thank you....
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[quote user="Paul S"] Which caps exactly did you decide to try? I don't recognize the big black jobbies. Are they oilers? Are they 200V? [/quote]
I did not “decide” but went with what I had in my hands. They are the Ansars from the...
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Which caps exactly did you decide to try? I don't recognize the big black jobbies. Are they oilers? Are they 200V?Sticking with the Hammond chokes?Best regards,Paul S...
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Here is another question that almost from the DIY-Audio universe. Dima is finishing Zaratustra II amplifiers. It will be quite interesting beast and I’m slowing begin to think about the power supplies – it will be my responsibility. The Zaratust...
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[quote user="Dominik"]Tribute give me best price... Romy, Can You help me with choosing L1, L2, L3, L4?http://www.hammondmfg.com/5cchk.htmAnd DL1, DL2 http://www.magnecraft.com/time_delay_sensor_relays.php[/quote]
Dominik,
The Magnecraft re...
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I bought the Lundahl chokes for L1 and was not able to us them and they were insultingly sharp. For the L1 you would need more henries and more DCR, the higher DCR will sound better and the “bad” and “cheap” Hammond chokes worked very fine. You...
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[quote user="hagtech"] Yes, steel chassis can be both good and bad. It likes to conduct magnetic fields, so you have to treat things appropriately. A little spacing under a choke can go a long way. Otherise you have a 120Hz motor.&n...
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[quote user="hagtech"] Iwas going to ask you about that funny looking damping material. Then you explained it at bottom of post. Very clever to use mouse pads! Lately I've been using cork & buna rubber sheets from McMaster-Carr....
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Oh, Romy, I meant the air caps in the corrector loop of course!!!Adjusting PS caps I leave to AA morons and alike.Believe me or not I did go very serious about the proper choke input operation.What I meant is that I have to get hold of a scope to che...
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I find this project so fascinating. I find it particularly interesting because one of my first experiences of good sound involved a field coil driver. Many years ago my grandfather bought an old hammond chord organ(predates the b3 and other...
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Yes, steel chassis can be both good and bad. It likes to conduct magnetic fields, so you have to treat things appropriately. A little spacing under a choke can go a long way. Otherise you have a 120Hz motor. I have another tri...
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[quote]Do you plan to develop this amp to a commercial product?[/quote]Yes, this is slated for production. But I really doubt I will sell many. Perhaps a few pairs. It's a bit out of the mainstream. Really need to us...
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Romy, As you're planning to run a 6K load, you can run less current without the transfer curve suffering as much. So, another shot at some numbers.... rather than use a RC setup to drop the voltage, Hammond (not my favorite) make an open f...
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Nice looking unit, N-set. I also go out of my way to use part leads only in lieu of extra wire whenever possible. I really don't care what it "looks like" on this score. At least your wires are all nicely dressed. You will find out soon enough if...
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Here are some schematics of what I've done. Sorry for not being the best at drawing. Some of the part choicesare a function of what I could get or what I've got and may not be optimal.The power entry of the PSU box:The PSU box continued:The power tra...
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[quote user="Romy the Cat"]I bought the Lundahl chokes for L1 and was not able to us them and they were insultingly sharp. For the L1 you would need more henries and more DCR, the higher DCR will sound better and the “bad” and “cheap” Hammond chokes ...
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I chose the 170V point as midway between the 250V supply I had for the CCS plate load. The choice was for maximal signal swing in both directions. [quote]in a properly designed amplifier a transformer should clip before the active stages[...
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I am looking into building a 45 tube SET amp and I keep reading about how important a good output transformer is. I read that cheaper output transformers like Hammond can be okay for mids and highs, but it will also reduce bass performance. If on...
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Nope, I do not have any proof to the rumor as I do not use the Japanese transformers. I heard them many times, was not liking the entire sound of the playbacks (do not blame only transformers for that) but since I never myself dealt with Japanese tra...
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But here it is. I made this monoblock fit into less than a square foot. It is tight. I use Hammond iron throughout. Their stuff usually works pretty good for power supplies. I have some photos at my blog. [img]http...
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…the theory that you not correctly presented BTW. Is it in an amp with a half-dozen series transformers Sakuma has the “killing bass”? The Sakuma amps are bandwidth limited by default, it is what BTW Sakuma went to DSET to fight the bandw...
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...this is my first serious attempt to pack something into a case.[quote user="Paul S"]Nice looking unit, N-set. I also go out of my way to use part leads only in lieu of extra wire whenever possible. I really don't care what it "looks like" on thi...
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[quote user="Romy the Cat"]3) There is a mistake in Milq circuit. The B+ of the driver stage has almost insufficient amount of critical inductance. It was because I drew the circuit having the Super Milq in my head where the PS was feeding 3 stages a...
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[quote user="hagtech"]Yes, steel chassis can be both good and bad. It likes to conduct magnetic fields, so you have to treat things appropriately. A little spacing under a choke can go a long way. Otherise you have a 120Hz motor.&nb...
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[quote user="N-set"]Oh, Romy, I meant the air caps in the corrector loop of course!!!Adjusting PS caps I leave to AA morons and alike.Believe me or not I did go very serious about the proper choke input operation.What I meant is that I have to ge...
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Here is another, simplified assault after some rethink and PSUD simulations.Rectifier: 3x1.2kV SiC per phase should do the job, actually 2 would do, but I'd preferto be safe. Bridge I don't want, as there would be 6 not 3 diodes switching1750V. 1.2kV...
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Hi Roman
I'm slowly gathering parts to build your amp.
In my old email to you I've mentioned that I have a pair of monster transformers 310-0-310 2A .I'd like to use them as a main transformer for bi-tri amp configuration ,with input choke load and...
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Gordon Rankin of Wavelength Audio did a series of one-stage DHTs with a step-up transformer input about ten years ago. I think they were called the Mercury series. By all accounts, they sounded good, but of course had limited gain, not much power and...
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[quote user="Wojtek"] In my old email to you I've mentioned that I have a pair of monster transformers 310-0-310 2A .I'd like to use them as a main transformer for bi-tri amp configuration ,with input choke load and folowing separating (tree branches...
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