tag:blogger.com,1999:blog-3395121002488101245.post2722086720457706231..comments2024-03-27T21:35:18.692-04:00Comments on Doctorjohn Cheaptubeaudio: Audio Reviews and More: Overview: WAVACdoctorjohnhttp://www.blogger.com/profile/11301768655128512295noreply@blogger.comBlogger20125tag:blogger.com,1999:blog-3395121002488101245.post-82137196776777048512023-06-05T05:04:44.558-04:002023-06-05T05:04:44.558-04:00The GT is surely a little higher rated than the G,...The GT is surely a little higher rated than the G, but the Wavac only uses it as driver, so the dissipation would not be high (as in using it as power tube). The G works for me. But stick with the tubes that came with the amp for a while and see what you think, if you need more warmth. Rolling the T7 would be fruitful too. You can also use U7 likely.doctorjohnhttps://www.blogger.com/profile/11301768655128512295noreply@blogger.comtag:blogger.com,1999:blog-3395121002488101245.post-1372870878648112622023-06-05T05:00:09.852-04:002023-06-05T05:00:09.852-04:00The filament can be pretty bright, but the plate s...The filament can be pretty bright, but the plate should not be glowing. Noise could be contact or problem with tube. The noise could be due to a poorly spec'ed tube too, Without a tube tester can't be sure, so I say perhaps return it! Sorry for the experience? What do u think of the Wavac anyway?doctorjohnhttps://www.blogger.com/profile/11301768655128512295noreply@blogger.comtag:blogger.com,1999:blog-3395121002488101245.post-3452962212077524452023-06-05T02:50:18.999-04:002023-06-05T02:50:18.999-04:00Hi Doctorjohn, I bought the wavac md-300b and i ha...Hi Doctorjohn, I bought the wavac md-300b and i have one question for you.<br />You recommended changing 6y6 tubes to ST shape. Anyway i bought RCA 6Y6G (black top, black plastic base) tubes from ebay seller, and once i put them in the middle top metal filament started to light bright orange, and there was noise from the both speakers. This noise stayed the same regardess of the volume, and i hadAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-3395121002488101245.post-71134667006452221292015-06-01T07:54:00.346-04:002015-06-01T07:54:00.346-04:00This is really strange. Your assumptions and logic...This is really strange. Your assumptions and logical and I have no idea why the the grey cable is also connected to the circuit board. Maybe I shall open my MD-811 in due course to see what is going on.<br /><br />One possibility is the 16 ohm tap is used for feedback?<br /><br />doctorjohnhttps://www.blogger.com/profile/11301768655128512295noreply@blogger.comtag:blogger.com,1999:blog-3395121002488101245.post-13222917904394621192015-05-29T23:57:08.301-04:002015-05-29T23:57:08.301-04:00Hi Doctorjohn, thanks for your prompt response.
...Hi Doctorjohn, thanks for your prompt response. <br />Just yesterday evening I managed to ply open the chassis and top casing. I saw the output transformer but there is no output taps with any marking. However each transformer has 4 cables from the secondary windings coded with different colors. The arrangement of the cables start from Red (left most)--> White-->Green-->Grey (right mostAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-3395121002488101245.post-60060606359599729682015-05-29T06:57:48.492-04:002015-05-29T06:57:48.492-04:00First, the MD300B should have an 4 ohm (and 16 ohm...First, the MD300B should have an 4 ohm (and 16 ohm) tap (as the MD-811 does from the circuit diagram).<br /><br />The sonic difference is likely audible but small, especially since the small WE755A full-range does not have much bass output. However, it is a worthwhile pursuit since your WE is priceless and one should squeeze every bit of performance out of it, no? Opening the chassis and doctorjohnhttps://www.blogger.com/profile/11301768655128512295noreply@blogger.comtag:blogger.com,1999:blog-3395121002488101245.post-11662502146802272832015-05-28T23:43:24.721-04:002015-05-28T23:43:24.721-04:00Hi DoctorJohn,
Recently I bought a used MD300B and...Hi DoctorJohn,<br />Recently I bought a used MD300B and has since paired it with a pair of WE755a speakers with 4 ohms impedance.<br />From the info that I have gathered, the MD300B speaker output is on 8 ohms tap. I am now toying the idea if I should change the 8 ohms tap to 4 ohms to get better sounding or just leave it as it is if the change improvement is not significant.<br />Would be happy Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-3395121002488101245.post-89175373370384732702015-04-29T15:42:14.023-04:002015-04-29T15:42:14.023-04:00Hi Ugo, if you see this message, please contact me...Hi Ugo, if you see this message, please contact me by email (see right sidebar). b_online is keen to get in contact with you.doctorjohnhttps://www.blogger.com/profile/11301768655128512295noreply@blogger.comtag:blogger.com,1999:blog-3395121002488101245.post-70585327386329130432015-04-28T07:40:12.073-04:002015-04-28T07:40:12.073-04:00Thank you for the surprise arrival of the Ultraana...Thank you for the surprise arrival of the Ultraanalogue Recordings CD of Beethoven/Rachmaninov Cello Sonatas. Excellent sound; enjoying it now!doctorjohnhttps://www.blogger.com/profile/11301768655128512295noreply@blogger.comtag:blogger.com,1999:blog-3395121002488101245.post-35684876311657872132015-04-28T07:37:46.169-04:002015-04-28T07:37:46.169-04:00This comment has been removed by the author.doctorjohnhttps://www.blogger.com/profile/11301768655128512295noreply@blogger.comtag:blogger.com,1999:blog-3395121002488101245.post-36956676472514623612015-04-28T06:06:56.158-04:002015-04-28T06:06:56.158-04:00Hello Ugo ,
I was thinking of purchasing a pair o...Hello Ugo ,<br /><br />I was thinking of purchasing a pair of Elrog 300b valves myself :)<br />I would appreciate it if you could further comment on your experience with them in the EC-300B. <br />What other valves have you tried before the Elrogs in the EC-300B ? <br /><br />I would appreciate it if you could provide me with your contact details, so we can exchange our findings with the EC-300B b_onlinenoreply@blogger.comtag:blogger.com,1999:blog-3395121002488101245.post-1301082655850697892015-04-27T16:08:49.608-04:002015-04-27T16:08:49.608-04:00Hello Ugo,
I was thinking about ordering a pair o...Hello Ugo,<br /><br />I was thinking about ordering a pair of Elrog 300bs myself. Could you let me know how they are performing with your Wavac and how you feel they compare to other tubes you have tried so far? <br /><br />Also, could you please send me an email (Doctorjohn can provide my @ to you) ?<br />I'd like to be able to keep in touch, so we can share our findings on the Wavac.<br /><b_onlinenoreply@blogger.comtag:blogger.com,1999:blog-3395121002488101245.post-81250769778378300872015-04-26T06:32:57.630-04:002015-04-26T06:32:57.630-04:00Hi Ugo, as mentioned in another article, it is my ...Hi Ugo, as mentioned in another article, it is my friend Karma who has the EC-300B, not I (mine is the MD-300B). So, I don't have tube rolling experience on this amp. I am not sure if Wavac specifies that 6L6GC has to be used (stock tubes use modern tubes, which only have high rating GC and equivalents). If any 6L6 would do (likely), I myself would try out the ST shaped 6L6Gs or GAs. WE350B doctorjohnhttps://www.blogger.com/profile/11301768655128512295noreply@blogger.comtag:blogger.com,1999:blog-3395121002488101245.post-44855091619199866592015-04-26T03:23:06.905-04:002015-04-26T03:23:06.905-04:00Hi Doctor John, being an happy owner of the Wavac ...Hi Doctor John, being an happy owner of the Wavac EC-300B, I'd like you to share your experience regarding tube rolling on this amp. I have tried the Elrog -300B and they play simply stunning on the Wavac. What is your experience about 6L6GC and WE 435a tube rolling; have you ever tried the Nec 6rr21 to replace the WE435a? ANy thought or suggestion about 6l6GC? Your insights and experience Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-3395121002488101245.post-76453055413138924722015-02-21T11:18:37.161-05:002015-02-21T11:18:37.161-05:00Hi Doctorjohn,
Good news regarding your comment &...Hi Doctorjohn,<br /><br />Good news regarding your comment "I wonder if there's another example of DHT being used in a recording studio? Is there better evidence of the triode's ability to faithfully reproduce the event?", please check Dr Ed Pong's (from Toronto, Canada) link: http://ultraanaloguerecordings.com/wpsite/home/ for more details and listen to his music samples. Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-3395121002488101245.post-91570435722738894042014-11-03T11:58:10.407-05:002014-11-03T11:58:10.407-05:00PM sent PM sent b_onlinenoreply@blogger.comtag:blogger.com,1999:blog-3395121002488101245.post-83372608916533738082014-10-29T09:20:05.959-04:002014-10-29T09:20:05.959-04:00
Hello b_online:
I completely agree with you and...<br /><br />Hello b_online:<br /><br />I completely agree with you and your Spanish Soul!<br /><br />Spain is wonderful! Maybe I should not say that, as the only place I have been to is Barcelona. But what a place! Great food and warm people!<br /><br />Please do not misunderstand me. The Wavac amps are FANTASTIC. the MD-805 I have no use for, as it has too much power. But I do have doubts about doctorjohnhttps://www.blogger.com/profile/11301768655128512295noreply@blogger.comtag:blogger.com,1999:blog-3395121002488101245.post-64402001853792857992014-10-28T07:32:04.543-04:002014-10-28T07:32:04.543-04:00Hi Doc,
I live in northern Spain. We don´t know e...Hi Doc,<br /><br />I live in northern Spain. We don´t know each other, I haven´t had the pleasure yet.<br />I travel almost every 1 or 2 years to NYC , so I will try to ping you next time in order to give you some nice spanish wine :) <br />(you are based in HongKong and NYC, right ?)<br /><br />My impression about Interstage Transformers has allways been very similar to yours. I allways found b_onlinenoreply@blogger.comtag:blogger.com,1999:blog-3395121002488101245.post-65956227236323021752014-10-25T23:01:02.266-04:002014-10-25T23:01:02.266-04:00I am not sure how to answer this. With the highest...I am not sure how to answer this. With the highest end, description is difficult. Even the best writers in the trade magazines (they are very good writers, though one may or may not trust what they write) have a hard time. Usually they would point to things being more real, palpable etc. But when you talk about difference, that is even more difficult, which is why you don't find much doctorjohnhttps://www.blogger.com/profile/11301768655128512295noreply@blogger.comtag:blogger.com,1999:blog-3395121002488101245.post-91451158114268264852014-10-25T02:39:09.147-04:002014-10-25T02:39:09.147-04:00Hello doc,
Would you care to comment on the diffe...Hello doc,<br /><br />Would you care to comment on the differences between Wavac and Kondo? As a user of Wavac (Ec300b) I am very curious. <br /><br />Kondo is often referred to as a "holy grail" by many people online, but very little people comment about Wavac, as they are far less known. <br />I assume this has a lot to do with the fact of the ongaku price/set condition/bass+power Anonymousnoreply@blogger.com