tag:blogger.com,1999:blog-163956915063920487.post8814260959963097380..comments2024-01-04T18:54:25.344-08:00Comments on akavalve: Fender Champion 600 12DW7 / ECC832 Mod Part 2akavalvehttp://www.blogger.com/profile/12711596868057550892noreply@blogger.comBlogger6125tag:blogger.com,1999:blog-163956915063920487.post-39252111727121961662013-07-04T09:53:11.637-07:002013-07-04T09:53:11.637-07:00Anyone tried using them in a circuit where one sid...Anyone tried using them in a circuit where one side is a gain stage, and the other a cathode-follower buffer (e.g., Marshall)? Seems to me the 12AU7 side would work well in the buffer part, leaving the gain stage more or less unchanged.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-163956915063920487.post-27707255326803286722010-11-17T10:25:02.464-08:002010-11-17T10:25:02.464-08:00I got mine from Radical Music:
Radical Music Inc
...I got mine from Radical Music:<br /><br />Radical Music Inc<br />10031 N 31st Street<br />Phoenix, AZ 85028-4408<br />Phone:(602) 788-6499<br /><br />They had a very broad stock of the JJ line a while back at least.<br /><br />I actually have a few new ECC823 left from that order. If they don't stock them anymore I'd be glad to sell you one if you'd like to try it out. Just send me an email and we'll work it out.<br /><br />-Andyakavalvehttps://www.blogger.com/profile/12711596868057550892noreply@blogger.comtag:blogger.com,1999:blog-163956915063920487.post-13432821641713196032010-11-17T09:50:59.430-08:002010-11-17T09:50:59.430-08:00No one sells Ecc823's because JJ will only pro...No one sells Ecc823's because JJ will only produce them in batches of 1000. So rewiring the tube is necessary. Just rotate it so you can keep the same leads. Takes 5 minutes. I'm messing around with a 12dw7(ecc832) in my princeton reverb. sounds good. but you need to change resistor values though to accommodate for the 12au7 side.lookahhttps://www.blogger.com/profile/02321998249136358211noreply@blogger.comtag:blogger.com,1999:blog-163956915063920487.post-32722618376643465722009-08-20T21:34:14.155-07:002009-08-20T21:34:14.155-07:00It seems to me that the ECC832 or 823 would be sui...It seems to me that the ECC832 or 823 would be suited for use in a cathodyne circuit as phase splitter & final gain. One side of the tube works at unity - so something with the gain and current capacity of a 12AU7 would work great and the other side is a gain stage where a 12AX7 would be desirable.<br /><br />I have 2 amps based on a Princeton Reverb circuit and was thinking of trying it. On the other hand, it is probably a waste of money since 12AX7's are pretty reasonably priced.<br /><br />I have a circuit diagram for one of the amps (Allen Sweet Spot) and the 12DW7 has the pinout backwards from what I'd need - 1, 2 & 3 are the phase inverter and 6, 7, & 8 are the final gain stage. I'd need the ECC823.Ed Storernoreply@blogger.comtag:blogger.com,1999:blog-163956915063920487.post-72194563770800710972009-02-01T16:33:00.000-08:002009-02-01T16:33:00.000-08:00Hey Androphus,I was wondering who might catch that...Hey Androphus,<BR/><BR/>I was wondering who might catch that! I'd been meaning to make a post of this - probably still will eventually.<BR/><BR/>I'd originally thought that the "section 1" of a 12DW7 started, logically it seemed, with pin 1(the plate). Looking more closely at the V4 schematic I realized that "section 2" plate is actually on pin 1 and that the section 1 has it's plate on pin 6. A bit backward and a reversal of the order I orginally thought they were in.<BR/><BR/>The European number for the 12DW7 is ECC832. JJ makes an ECC832 and also offers an ECC823 (the same tube with the sections reversed). Unfortunately it's a special run with a minimum order of $1000.<BR/><BR/>I did find one place (Radical Music) which carries a very broad selection of JJ's and actually had a stock of the ECC823's. I bought a few of them to try out.<BR/><BR/>I've had a chance to compare the ECC832 and the ECC823 briefly in the Champion 600 and the Valve Junior. I didn't rebias the stages - just popped them in. <BR/>The tests were quick but the initial report is that the ECC832 and the ECC823 sound pretty much the same in both those circuits. I'm getting ready to do some work on a pair of Valve Juniors and hope to make a more thorough investigation of the 832/823 a part of it. I'll let you know what I find.<BR/><BR/>Best, Andyakavalvehttps://www.blogger.com/profile/12711596868057550892noreply@blogger.comtag:blogger.com,1999:blog-163956915063920487.post-4051400617059535402009-01-29T15:13:00.000-08:002009-01-29T15:13:00.000-08:00Concerning the last paragraph; with the lower gai...Concerning the last paragraph; with the lower gain stage coming first in the Champ circuit, how will that differ from your earlier explanation which involves the higher gain stage first? Will there be any difference after the 2 stages?Anonymousnoreply@blogger.com