Search found 312 matches

by pedro
Tue Sep 20, 2022 8:15 am
Forum: Trainwreck Discussion
Topic: New 12w Liverpool build
Replies: 35
Views: 4975

Re: New 12w Liverpool build

Interesting …. I have found the harmonic content really is quite something. Even when playing or recording at relatively low volumes, with the treble cap engaged and the treble eq up beyong about 4 i can get easy harmonic feedback at conversation volumes This is through a thiele 1x12 cab with a cele...
by pedro
Mon Sep 19, 2022 9:38 am
Forum: Trainwreck Discussion
Topic: New 12w Liverpool build
Replies: 35
Views: 4975

Re: New 12w Liverpool build

Thanks guys Yeah. I guess too much additional circuitry kind of takes it further away from the purity of Kens designs I will try with a manual switch first and see how I like it Dblgun - yes I see the string of resistors on your board and how they are tapped in between for the plate supply. As i am ...
by pedro
Sat Sep 17, 2022 10:14 am
Forum: Trainwreck Discussion
Topic: New 12w Liverpool build
Replies: 35
Views: 4975

Re: New 12w Liverpool build

Is that on the second triode stage dblgun?
by pedro
Fri Sep 16, 2022 7:25 pm
Forum: Trainwreck Discussion
Topic: New 12w Liverpool build
Replies: 35
Views: 4975

Re: New 12w Liverpool build

Thanks Mark

I dont want to clog up dblguns thread any more - but quick question - would you put the fast/gradual switch on the second or third stage - i think the K60 has it on the second stage ?

Best,
Pete
by pedro
Fri Sep 16, 2022 7:09 am
Forum: Trainwreck Discussion
Topic: New 12w Liverpool build
Replies: 35
Views: 4975

Re: New 12w Liverpool build

That makes perfect sense Mark. I have been trying to work out how to add the fast/gradual switch to my amp without making a mess of the lead dress. I dont have a lot of space on the board and used eyelets together with the B+ wires being routed under the board. Consequently its going to make swappin...
by pedro
Thu Sep 15, 2022 7:27 pm
Forum: Trainwreck Discussion
Topic: New 12w Liverpool build
Replies: 35
Views: 4975

Re: New 12w Liverpool build

Youre so right about the apparent limited interest/activity around at the moment concerning these amps. I was around on the Dumble section of the forum many years ago and spent an awful lot of time chasing that tone but didnt have any real awareness if the TWs at that time and certainly didnt apprec...
by pedro
Tue Sep 13, 2022 7:23 am
Forum: Trainwreck Discussion
Topic: New 12w Liverpool build
Replies: 35
Views: 4975

Re: New 12w Liverpool build

Many thanks dblgun
Do you have any sound clips of the new build ?
by pedro
Mon Sep 12, 2022 8:48 pm
Forum: Trainwreck Discussion
Topic: New 12w Liverpool build
Replies: 35
Views: 4975

Re: New 12w Liverpool build

Hi. Great job on the new amp - looks great and i bet sounds wonderful.

I am making another express soon so i too would be interested in the part numbers for the vector boards and flea clips
Best,
Pete
by pedro
Thu Sep 08, 2022 5:25 pm
Forum: Trainwreck Discussion
Topic: Express build finished with PPIMV - cut control and NFB advice needed!
Replies: 16
Views: 2846

Re: Express build finished with PPIMV - cut control and NFB advice needed!

Thanks Roe, At the moment I have a combination of parallel caps to give me 0.0055uf with a 250k pot - probably cutting more highs for a slightly thicker tone. My tinnitus tends to push me towards rolling off a few more highs these days! I love being able to boost the highs early on ( at the guitar a...
by pedro
Wed Sep 07, 2022 8:25 am
Forum: Trainwreck Discussion
Topic: Express build finished with PPIMV - cut control and NFB advice needed!
Replies: 16
Views: 2846

Re: Express build finished with PPIMV - cut control and NFB advice needed!

Thanks for the info viperdoc.
I am going to stick with the existing tubes and try adding a split plate load switch to V2 using the komet approach
by pedro
Sun Sep 04, 2022 7:11 am
Forum: Trainwreck Discussion
Topic: Express build finished with PPIMV - cut control and NFB advice needed!
Replies: 16
Views: 2846

Re: Express build finished with PPIMV - cut control and NFB advice needed!

The 100/ 0 / 500pf switch is really handy. When I find a setting that’s just a bit too much on 500pf the 100pf option is great The 500pf does seem to boost the gain at higher volumes quite a bit though. I haven’t yet tried a long cable as Glen K does to tame the top end - that looks like a good opti...
by pedro
Sat Sep 03, 2022 9:30 pm
Forum: Trainwreck Discussion
Topic: Express build finished with PPIMV - cut control and NFB advice needed!
Replies: 16
Views: 2846

Re: Express build finished with PPIMV - cut control and NFB advice needed!

After trying a few different values I have settled on paralleling a 0.002uf and a 0.0033uf cap, and using a 250kA pot. I like the extra cut this gives. I also have switchable “bright” caps of 100pf or 500pf (or none) There is now a huge range of tones available using the combination of the bright ca...
by pedro
Sat Sep 03, 2022 12:26 pm
Forum: Trainwreck Discussion
Topic: Express build finished with PPIMV - cut control and NFB advice needed!
Replies: 16
Views: 2846

Re: Express build finished with PPIMV - cut control and NFB advice needed!

Happy to report thats its all now wired in and working fine. I mught experiment with different value caps to see whether the cut frequencies land
by pedro
Sat Sep 03, 2022 10:33 am
Forum: Trainwreck Discussion
Topic: Express build finished with PPIMV - cut control and NFB advice needed!
Replies: 16
Views: 2846

Re: Express build finished with PPIMV - cut control and NFB advice needed!

Thats great Martin - many thanks for your help its much appreciated

I love this amp and need to build a rocket or liverpool next this Autumn

I guess i have been lucky with my lead dress and layout judging by many other build posts

PeteC
by pedro
Fri Sep 02, 2022 7:52 pm
Forum: Trainwreck Discussion
Topic: Express build finished with PPIMV - cut control and NFB advice needed!
Replies: 16
Views: 2846

Re: Express build finished with PPIMV - cut control and NFB advice needed!

Thanks Martin, Yes I intend to use the front panel presence hole for the cut control At the moment I only have 250k pot and 0.002ufs on hand ( no 0.0047s ). Would this be worth trying ? I tend to keep my presence settings very low or around 9 o’clock. What fixed value would be worth trying - 100k ? ...