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Answers to your Eddie Current questions! - Page 2

post #16 of 292
Quote:
Originally Posted by acs236
Newark, Ohio -- 30-45 minutes east of Columbus.
Ack, that's a bit of a drive from NW Ohio... it would probably be cheaper to buy the amp than the cost of gas to get down there these days
post #17 of 292
Quote:
Originally Posted by sacd lover
The hd 300 is made for high impedence headphones while the transformer coupled version will drive any headphone impedence.
I don't suppose that Craig mentioned anything about an impedancer to you (or anyone else)?

He and I discussed the possibility of building either a standalone external impedancer or an add-on internal impedancer circuit for the HD300, and he bought some transformers to experiment with. An external impedancer (a là Audio Valve's Impedanzer) seemed like a done deal after the transformer values were worked out, but he hasn't gotten back to me and I haven't followed up. I suspect that he hasn't worked on the impedancer because he's been too busy working on the HD300s.

D.
post #18 of 292
Thread Starter 
Quote:
Originally Posted by Demolition
I don't suppose that Craig mentioned anything about an impedancer to you (or anyone else)?

He and I discussed the possibility of building either a standalone external impedancer or an add-on internal impedancer circuit for the HD300, and he bought some transformers to experiment with. An external impedancer (a là Audio Valve's Impedanzer) seemed like a done deal after the transformer values were worked out, but he hasn't gotten back to me and I haven't followed up. I suspect that he hasn't worked on the impedancer because he's been too busy working on the HD300s.

D.

Not a word. Now that he has finalized the hd 25 I suspect he will have you change the hd 300 over to a hd 25 if you need low impedence drive capability.
post #19 of 292
Quote:
Originally Posted by sacd lover
Not a word. Now that he has finalized the hd 25 I suspect he will have you change the hd 300 over to a hd 25 if you need low impedence drive capability.
This might be the impetus that I need to build my own impedancer. I have one that I can study/dissect, plus I've discussed the types and values of the necessary transformers with Craig. Should be a fairly simple matter to build one for testing.

Now, I just need to get off my butt and do it.

D.
post #20 of 292
Quote:
Originally Posted by sacd lover
However, there are superior sounding examples of transformer coupled tube amps like the RKV as well.
Actually the RKV is OTL, not transformer coupled, which is why the Impedanzer is needed with low impedance headphones.
post #21 of 292
i'm #3 - whats the estimated shipping date?
post #22 of 292
Thread Starter 
Quote:
Originally Posted by Hirsch
Actually the RKV is OTL, not transformer coupled, which is why the Impedanzer is needed with low impedance headphones.
Whoops I was actually thinking of the EAR headamp that you sold to gpalmer. WHAT A COINCIDENCE YOU WERE THE ONE TO CORRECT ME. I do hope the EAR has output transformers or its .

kelesh,
The ship date is next week assuming the caps actually get to Craig.
post #23 of 292
Quote:
Originally Posted by sacd lover
I do hope the EAR has output transformers or its .
Yep. Tim de Paravicini does transformers well, and isn't afraid to use them. The EAR HP4 not only has output transformers, but input transformers as well.
post #24 of 292
its been 11 weeks since I parted with my money... any word on the amp shipping?
post #25 of 292
Quote:
Originally Posted by kelesh
its been 11 weeks since I parted with my money... any word on the amp shipping?
Yes, we're all in the same boat. I'm sure that everyone is anxious to get their amps.

Actually, you'd probably be one of the first to hear if the amps were shipping because your HD300 is serial number 3 (correct?) and I was under the impression that Craig was building them sequentially. Anyway, Craig stated via e-mail that he'd let us know when the amps would go out the door, so once yours is finished, I suspect that you'll hear about it pretty quick.

Of course, if the waiting is driving you insane (too late! ), then there's no harm in sending Craig an e-mail. But, just remember that every time that he has to put the soldering iron down to answer e-mail, then that just tacks on a few more minutes to the time that we've already spent waiting.

D.
post #26 of 292
I thought I would post Craig's e-mail response to my inquiry re: shipping time.

I was hoping to ship the first five amps this week. I am taking a little extra time to A/B the HD300 with the HD25. I just want to make sure any tweaks that are necessary are all there in the first batch. The shipping price was for UPS ground. If you want to upgrade to three day blue or red that's cool.
Craig

I will e-mail a response asking for the cost to upgrade the shipping. If anyone is interested in his response, let me know.
post #27 of 292
Craig just e-mailed me and said that the first five amps should be shipped a week from today.
post #28 of 292
Thread Starter 
Quote:
Originally Posted by tyrion
Craig just e-mailed me and said that the first five amps should be shipped a week from today.
Thanks for the info. I am glad to know we will soon be getting them.
post #29 of 292
Thread Starter 
I had an awesome chat with Craig today. He has held up the amp because he wants to make sure they have consistency and he said, "I want the hundredth amp to sound just like he first one". He will ship the first five amps next Thursday with the remainder to soon follow.

He apologized the amps took so long but the metal supplier difficulties and the problem getting the caps could not be overcome. He said, if anyone is tired of waiting he will give you a full refund; no kidding!

He told me the amp actually cost $5 more to build than he charged us. He had quoted the price based on 50 amps and selling only 12 he didnt get the volume pricing to meet his cost. In the future he is going to have to raise the price. Depending on which amp sells the best, he wants to make only one model. He is planning on building a run of 50 amps and stocking them. He is not sure if he will build 25 of each or 50 of one of the amps. The cost will be less the more he builds which is why he would prefer to sell only one model. If he splits the order the hd 300 will run around $525 with the hd 25 costing slightly more. If he runs only one amp he hopes to keep the price around the "magical" $500 mark.

The amps despite being identical except for output caps in the hd 300 and transformers in the hd 25 sound very different. He has listened extensively and had some trusted ears audition them and their preferances were clear depending on the headphones used.

He is not very pleased with the sovtek 6sn7 and will likely switch to the EH 6sn7 on the next amp run. The sovtek 6as7 seems to be very good and he will continue using this tube. The sovtek 6sn7 has some problems with being noisy after it warms up. This is more problematic with the hd 25; the hd 300 doesnt appear to have consistent problems with the tube.

He quoted me how overbuilt this amp is and he predicts the amp will last a lifetime. He is very pleased with the results and stated the line stage is going to be excellent. The build quality is very good and he seems very proud of the result; particularly given the cost of the amps. The tube sockets are his only worry as he thinks they could wear out with perpetual tube rolling. He is currently changing tubes in one of the amps to see if a problem developes; so far no problem. I cant tell you what type of tube socket he used but they can be easily replaced.

The specialized cap for the line stage that was the holdup is 3" in diameter and weighs around one pound. He predicts the line stage will be first rate. The power supply uses some high quality hexfred diodes and is QUIET.

We talked for an hour or so and thats what sticks out in my mind. If I remember anything else I will post.
post #30 of 292
Meh. I truly cannot afford an HD25 anymore but I'm going to be hard pressed to turn down the opportunity to buy one.

Sorry about my wallet. More like sorry about my grad school fees!
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