Doge 6210 - another great headphone amp - Page 20  

How was pin 1 of which output tube connected when you found it?

A fault as you describe would have totally disabled the output in one channel if only on one chanel was miswired, or both channels if the fault was on both channels.

Your second report, of miswiring, is as fishy as the initial "transformer wire broken" report - which didn't wash at all in terms of distorted sound and low volume on both channels.

My Doge amps both use vinyl coated wire and not the thin paper wrapped wires you described.

My Doge amps use alos two small bolts and nuts on each tube to attach the tube socket. You said SACDlovers tube sockets were glued in place.

Can you take a picture of the top of SACDlover's amp with no tubes in it, so we can see if there are two bolts on each side of each tube socket to hold the socket in place?

You imply there were no such bolts -only glue.

I would mention that some glue would be an excellent idea to reinforce the sockets - if bolts were also used.

I submit to you that SACD lovers amp was playing fine when you got it.

I submit to you that SACD lover was motivated in buying the amp from me so he would be able to say it is inferior to the Singlepower, which he touts frequently, in saying the Doge was distorted with weak volume.

Then when others chimed in and said their Doge amps were not distorted and had no weak volume, SACDlover was forced to say the amp was defective (which it was not) and complain about me and the amp. Several posters then had negative comments both about me and the Doge amp, which are totally unjustified. He was afraid to send the amp back to me because I would see it was not defective.

He sent it to you for mods.

I submit you are cooperating nicely with SACDlover and supporting him.

Now where are those pictures showing SACD lover's tube sockets are not bolted in place but instead glued?

BTW SACDlover has $35 worth of tubes I sent him when he complained about the first amp I sent him. He said (before they arrived) that he would refuse shipment of them so they would be returned to me at no expense to him. He never did.

SACDlover reported to me that one tube glowed, and he immediately turned it off, but that other tubes did not do this.

Must have been one bad tube.

Yes, it is an unfortunate matter.

SACDlover's and Cotdt's lies have defamed me, the Doge amp, and Cattylink's products. I believe I have a right to defend myself from their lies and let the truth be known. Here is reality:


I sent SACDlover a new Doge 6210 amp.

He said it was distorted and had low volume, and posted here on the inferiority of the amp to the Singlepower amp.

I immediately sent him a second Doge before his first amp arrived back to me. This replacement was thoroughly tested for days when I got it, and then again before I sent it to SACDlover - it was doubly checked to be fine.

The next day I sent SACDlover four new tubes (two Electro Harmonix 12AX7 and two Russian military 6P14P EB) to use and then either later return or send payment to me of $35. I thought the problems he had experienced were tube related. However, he said he would return these tubes back to me by refusing shipment since he did not think the problems were tube related. He never did return the tubes and has not sent me the $35 – and this is theft .

I got the first amp back and found it was fine, not distorted with low volume as SACDlover had said it was.

Then SACDlover said the second amp (I had tested as good) was also distorted with low volume. I know it was fine when I shipped it to him.

I told him both amps were fine and that he had only bought them to post how bad they were compared to Singlepower amps he always touts. Why else would he lie about the quality of the amps sent him that I knew were good?

Then Doge owners posted and said SACDlover's complaints of distortion and low volume were unwarranted in their own experience with the amp.

So SACDlover changed his story and said the amp must be defective. This was another lie - both amps were fine in my listening tests.

SACDlover said (on a weekend) he would send the second amp for repair next Monday. I knew the amp was good and that he would enlist someone to lie, in backing his lie, and say his amp was defective. I posted on that weekend (before he had sent the amp off to someone else) for him to send it back to me for repair or replacement and that I would then have a volunteer Doge owner first listen to the amp and be sure it was fine before forwarding the repaired/replaced amp on to SACDlover.

SACDlover would not send the second amp back to me as he knew it was not defective and this would be discovered, so he sent it Cotdt who would, and did, lie for him to support SCADlover’s lie that he amp was defective.

Cotdt then told multiple and obvious lies about the Doge amp from SACDlover. Cotdt is very inept at lying as we shall see.

Cotdt said SCADlover’s amp had a broken transformer wire (which he said was maybe broken in shipment) which he repaired to make the amp sound good - an impossibility since internal wires don't ever break in shipment - Cotdt's first lie. Also a broken transformer wire would not cause the problems SACDlover lied about.

Cotdt also said the wires were thin and brittle, and used paper insulation - of low quality compared to Cotdt’s amp he got from Pacificvalve. This was his second lie which Cotdt put in to explain why the transformer wire got broken without any sabotage on SACDlover's part. Internal wires do not break in shipment unless the whole amp is somehow ripped apart or unless some heavy internal part comes loose and bangs around violently inside the amp. Never happens.

I commented that this broken transformer wire would make the amp inoperable instead of distorted and low volume as SACDlover had said, and I asked Cotdt which wire was broken (and on which transformer) that he repaired?. He didn't answer and I had to ask him again.

In answering my repeated question, Cotdt realized his first story was implausible and that he had to change his story in view of my remarks. So Cotdt changed his story to miswiring in pin 1 of the output tubes - Cotdt's third lie. In saying SACDlover's amp was wired improperly, this was no honest mistake in reporting on Cotdt's part - you don't make a memory mistake of going from a non-existent thin and brittle transformer wire being broken in shipping, to the story of, "Oh, I made a mistake - it was wires to pin 1 of the output tubes that had been incorrectly wired and not a thin brittle transformer wire that had broken in shipment." Both reports were lies, the third lie to cover up the obvious falseness of the first and second lies, only this third lie is obviously false also.

This third lie is implausible because such a soldering error of both output tubes would have an obvious sound quality effect (assuming any sound output at all was possible) that would have been caught by Doge at the factory, or caught by Cattylink in their pre-testing
prior to shipment, or caught by me in my extensive listening with this amp.

I have asked Cotdt to tell me the pin 1 (of the output tubes) wiring error he corrected - what was wired in error to pin 1 at the factory?

I expect Cotdt to either not answer (since his lie will not explain SACDlover's complaints of distorted sound and low volume) or to say he can't remember.

Cotdt said SACDlover's amp had tube sockets glued in and these had come loose, unlike his amp from Pacificvalve. All my Doge amps use two bolts or screws, with nuts, to bolt the tube socket in place. Doge confirmed to me that this was true for all of their amps. When I used SACDlover's amps with many tube combos, the tube sockets were tightly bolted in place with no looseness. Cotdt lied about SACDlover's amp in this fourth lie, and I asked Cotdt to show us a picture of the top of the tube sockets that did not show two bolt heads on the sides of the sockets. We will never see such a picture for it would reveal that the tube sockets are bolted in, and thus reveal Cotdt's lie of being glued in.

Cotdt initially said the parts in his amp were so-so (when he first got it) now says his amp from Pacificvalve has better parts than SACDlover's Cattylink amp, such as better tube socket attachment (a lie) and better wires used (another lie). In supporting his lie about wire quality, Cotdt says his wiring is silver litz - Cotdt's fifth lie. Doge has reported to me that they have never used silver litz wires in the 6210 and that amps supplied to Cattylink are in no way inferior to amps supplied to Pacificvalve. Pacificvalve has even purchased stock from Cattylink in the past. Now you can ask Pacificvalve if they supply an amp like cotdt's, that uses silver litz wire, and they will laugh at you.

I opened SACDlover's first amp, he returned to me, and compared the inside parts to that of Cotdt's amp on page 9 of this thread. The wiring is the same with some color differences in the wires used and in the way the wires are routed. However the Cattylink amp apparently uses thicker wires than the Pacificvalve amp in the four wires that go from the front tot he back of the amp. These are black color in the Cattylink amp and white in the Pacificvalve amp co, Also, the Cattylink amp uses the highly regarded Rubycon power capacitors while the Pacificvalve amp uses a brand unknown to me (Leler or Peler brand, hard to read from Cotdt's photo) power capacitors. If anything, the Cattylink amp has better quality parts than the Pacificvalve amp - certainly at least as good.

Cotdt's lies are obvious.

Cotdt's Doge is exactly the same as those sold by Cattylink - no silver litz wiring used in any and no tube sockets that are only glued in place. and all using the same quality of wire or parts (though again the Rubycon in the Cattylink amp is a more highly regard power capacitor than the off-brand used in the Pacificvalve amp but I doubt this affects sound quality).

Cotdt does mods on the Doge 6210 and is likely trying to get Doge owners who bought from Cattylink to send in their "cheap parts" Doges to him for mods.

Photos in the next post reveal some of Cotdt’s lies.

Here is apicture of Cotdt's amp from Pacificvalve as shown on page 9 of this thread.




Here is a picture of SACDlover's first amp from Cattylink. Note that the black wires (thicker looking than Cotdt's white wires) are white in Cotdt's amp.




Here is a close-up up these black wires (with white paper put under them to illustrate them better) showing thick and high qua;ity construction of SACDlover's Cattylink amp.



Here are the high quality Rubycon power supply capacitors used in SACDlover's first Cattylink amp - compared to the off-brand Capacitors used in Cotdt's Pacificvalve amp. Note: my other Doge amp from Cattylink uses the same off-brand caps as does Cotdt's amp however. No sound differences that I can tell.




Conclusion: Doge amps from either Cattylink or Pacificvalve are the same in regards to quality of parts and quality of wiring and quality of tube sockets, and Cotdt's lies in this regard are to be ignored.

The Current USA price to Florida, of a Doge from Cattylink and one form Cattylink is $70 since Cattylink has raised their prices some. The amp quality is the same. As I have always said, USA owners may wish to pay the extra bucks in order to get a warranty usable in the USA - shipping the amp back in the USA is about $15 and thus is cheaper than the $40 sea mail to China. You save about $25 and much time, if you have to use the warranty, and buy in the USA from Pacificvalve. However, it is unlikely that you will ever need the warranty, and thus might take the risk and save the $70 by ordering from China.

I like Pacificvalve as they offer top quality Chinese products at very reasonable prices - their profit margin is quite low. The XianSheng 708B (not sold by Cattylink) from Pacificvalve is quite good for the very low cost, and the Bada 12 and Doge are tops at good prices from Pacificvalve.

Buy a Doge or Bada 12 from either source and you get a great amp for the money. Add a Rega Saturn CDP and a pair of AKG K701s and you have a top quality system that can meet or beat any other system for up to three times the price (perhaps even more).

Note to SACDlover: Send me my tubes back or send me $35.