bea
AmBASSador of the F Clef
You might either have them run through a tube tester of try them out. maybe in another amp? as long as You run them in a setting designed for the ECC83 this should be pretty safe
Tube Behavior - ECC823 Thread:
- Thread starter Inspector #20
- Start date
OP
OP
I am so pleased with this new tube experience that I want to put JJ-5751's in V3 and V4.
OP
Sure would be hard to get it sounding better than it is right now!!!!!
syscokid
Ambassador of War & Peace
Robert, or anybody else if your interested, I finally was able to find and download a PDF of the Marshall DSL40C schematic. Was not easy to find...
OK, in the best “let Mikey try it” what configuration are you really liking? That way I can jump right to that and give it a wurl
OP
OK, in the best “let Mikey try it” what configuration are you really liking? That way I can jump right to that and give it a wurl
Current setup was based on just what I had on hand:
V1 - JJ-ECC823
V2 - JJ-5751
V3 - JJ-ECC83-MG
V4 - 7025WA
Essentially, you could use the stock Marshall ECC83 tubes in V3 and V4. The JJ-ECC83-MG is a low gain 12AX7/ECC83 and the 7025WA is the same tube but a low noise variant.
In this configuration, I'm running gain at 6-7 on 'Lead 1' with Tone Shift 'In.'
The settings shown are what we are using for everything. It sounds great on Zeppelin's The Ocean and equally great on Judas Priest's Green Manalishi.
OP
Robert, or anybody else if your interested, I finally was able to find and download a PDF of the Marshall DSL40C schematic. Was not easy to find...
Awesome! Thank You!
bea
AmBASSador of the F Clef
Regarding the schematics this looks entirely plausible.
Again, when swapping V4 against something else care has to be taken for the heater / cathode limitation (Ufk in the data sheet of the tube) because of the demanding cathode follower.
OP
syscokid
Ambassador of War & Peace
Very welcome.
67plexi
Ambassador of Amps
I don't get R-38 4k7 V-2A that's a lot of current draw Try a 12AY7 in V-2 If it was me I would try a trimmer pot 5k R-38 with a 12AX7 and dial it in take a reading
and change that 4K7 my guess would be 1K5 to 2K2 range. All the DSL Marshall's I have played the overdrive channel sounded like A$$
V-2B is 2K2 100K plate resistors most use 1K5 not 2K2 and 4K7
The only time I have seen a 4K7 was to the presence pot for a negative feed back loop on a 100 watt amp.
V-1 is the overdrive channel R-15 220K / 1K8 V-1A R32 150K / 1K8 V-1B No voltage chart to bad.
I think Marshall got it backwards V-1 should have been the clean channel then V-2 should be the overdrive channel.
and change that 4K7 my guess would be 1K5 to 2K2 range. All the DSL Marshall's I have played the overdrive channel sounded like A$$
V-2B is 2K2 100K plate resistors most use 1K5 not 2K2 and 4K7
The only time I have seen a 4K7 was to the presence pot for a negative feed back loop on a 100 watt amp.
V-1 is the overdrive channel R-15 220K / 1K8 V-1A R32 150K / 1K8 V-1B No voltage chart to bad.
I think Marshall got it backwards V-1 should have been the clean channel then V-2 should be the overdrive channel.
OP
Hmmmm....
syscokid
Ambassador of War & Peace
I was surprised by that 220K plate resistor at V1a, too. But I just double checked over at the Marshall forum, and it is definitely like the schematic shows. Dropping the resistor at R15 down to 100K will reduce some of the initial gain overall, but it will also affect the Clean channel. You should see all the butt'load of info pertaining to the DSL40C at the Marshall forum! 513 pages:
The Official Marshall DSL40c Information Thread
OP
tell you what, this ECC823/5751/EXX83-MG/7025-WA is amazing!!!
