moj067 wrote:Did you exclude the .02uF cap after the 180k plate resistor on V2(a).
I know that isn't supposed to be there and could be why it was so boomy w/ the 47k slope.
Just checking.
Did you mean the .01? It´s excluded.
heisthl wrote:Sounds Dumbly
I hear a little leading edge "ping" what values are you using in the PI between the bias supply and the output tube grid resistors?
I don´t know what you mean..
Here are some pics...
The HRM board is turned because of the big Jensen paper in oil cap I had to put in there. The 716 cap that was there failed on me (microphonic) and this was the only cap I had left...
Yep, I mean't the .01uF, you got it.
I like the idea of tweaking your voltages with those trimmers.
I might try to do that feeding an internal D-Lator power supply.
Thanks for sharing.
heisthl wrote:What's with the trimmers on the PS board? If they're dropping string adjusters are they in series, or parallel?
Yeah a friend of mine, named Paul Klatser, came up with the idea. Its very handy, especially when changing tubes.
They are in series. They work fine except the first one. I had to remove it cause it burned out. (where the empty eyelets are, between the first two 22uf caps).
- Hammond Twin replacement PT and OT
- No bright cap on the OD master
- 100k slope resistor. The amp was very boomy with the 47k..
- 15n mid cap on the HRM board...
- Guitar used is an old japanese Westone semi,..
- speaker cab is 2x12 loaded with Emi Tonespotters...
Good clip. U got the tone.
+1 on the 100k Slope R. I did the same thing for the same reasons. I was thinking maybe the 47k would work better for a 1x12 cab, but with my 2x12 it was way boomy. Also, happy to see I am not the only one messing with the HRM mid cap. Actually I worked my way back to 22n, but really need a a 20n or slightly less to be perfect.
Last edited by Tonegeek on Thu Sep 03, 2009 11:56 pm, edited 1 time in total.
I was reading a post at another amp forum and the poster said it was acknowledged that the F & T electrolytics had a high leakage rate.
I had never heard that before and it didn't comfort me much since a couple months back I re-did my power supply in my D'Lite with all new F & T caps....
Anybody ever heard that? From what I have read the F & T caps are pretty highly regarded.
I hear some noise, likely to be computer noise maybe. But, in your room, is the amp quiet? How do you like those Hammond transformers? I've heared mixed opinions on them, and would like to hear from someone who's actually built an amp with them.
Please let me know as I was contemplating buying a pair of hammond transf. Their price is very attractive.
Thanks
I find the Hammond power transformers to be pretty much indestructible and very well built..There are however several things that I've found that I keep in mind when using them.. First and biggest is they generate a rather large field so you have to keep an eye on transformer placement..Our amps have a metal vented grill on the front so it pretty much keeps me from using the Hammond's.. Get a pair of single coils near the front it can get ugly.. Also if you use the Hammond's keep some spare fuses as they do have a higher in rush of current than most..(Do your lights flicker when you turn it on?)
The output transformers are again well built but can to me be a bit on the sterile side and don't saturate as quickly especially when you first install them...I think they were designed mostly for Hi Fi than guitar amps.. Still indestructible..
I was reading a post at another amp forum and the poster said it was acknowledged that the F & T electrolytics had a high leakage rate.
I had never heard that before and it didn't comfort me much since a couple months back I re-did my power supply in my D'Lite with all new F & T caps....
Anybody ever heard that? From what I have read the F & T caps are pretty highly regarded.
That's a first for me!!.. I've been using the TAD rebranded F&T's as well as the 2 stage 100/100's for a while Never had to replace 1 yet.. They are my 2nd fave behind the Sprague Atoms...Ken Fisher turned me on to them
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