DLite Build Almost Complete

[sst4270]

Greiswig,

I too feel that way sometimes...

"PI plate resistor sizes with trimmer" refers to the "resistors coming off of the 'plates' (pins 1 & 6) of the Phase Inverter (aka V3)" with the addition of a 10K trimmer, like the one used on V2, for fine tuning.

"150k slope resitor" I believe is referring to the 150k resistor/0.047 (0.05) uF combination coming off of the MID adjustment pot and the "slope" of the equalization curve those values create in the tone stack.

It's taken me a few years of building and countless hours of reading books, articles, and websites to understand that much myself.

It's a neverending adventure that I am glad to be on.

-Steve

[sst4270]

Thanks everyone for all the advice. I'll let you know very soon how it turns out.

[mlp-mx6]

The slope resistor is the one that separates the treble cap from the mid and bass caps on the "hot" side.

The slope resistor is the resistor IN the tone stack. In a regular Fender amp w/ 250pF, .1uF, and .047uF there is also a 100K resistor. That's the slope resistor.

In the Skyline EQ it is usually 150K. In a 5F6-A Bassman it is 56K. In a Marshall it is often 33K.

The slope resistor is the one that separates the treble cap from the mid and bass caps on the "hot" side.

[JimiB]

does this help? This is from the dlite schematic. Keep after it, it will start to make sense. When you look at a layout look at the schematic at the same time so you can see whats happening. Eventually the schematic will become better than a layout and you will be able to wire or draw layouts from a schematic.
Oh and listen to what dogears says. Just listen to his clips - he knows whats up. [/img]

[Structo]

Steve,

The rest of that particular layout is for an HRM amp and wouldn't be of much use. On the D'Lite I just completed it followed the BrownNote layout almost exactly except for the section shown and one resistor value. The 6k2 going to the impedance selector was changed to 4k7. Hope this helps. The improvement is DRAMATIC...... even with 6V6.

Hi Steve, I just finished a D'Lite 44 using 6L6's and was wondering what kind of sonic improvements you noticed with these changes.
How do the dropping resistor value changes you noted affect the plate voltages on the tubes?
And the change to the NFB resistor from 6k2 to 4k7?
Does this change more than the presence control?
Thanks all for helping us tube noobs.

[stelligan]

jurgen,

I did check the voltages, but did not compare them. They were in line - I did not record them. If I recall - the OD preamp tube was a tad higher than stock D'Lite. Here is a very sloppy clip of that amp going through the paces before I boxed it and sent it:
http://www.jonesin.org/Dave/JEamp.mp3
Forgive the playing. My right hand is in a splint - non-stenosing tenosynovitis. Tendon trouble especially in rt. ring finger. This is with that posted power supply and 6v6 tubes.

[dogears]

Sounded great!

So which tonestack is that? Skyline?

jurgen,

I did check the voltages, but did not compare them. They were in line - I did not record them. If I recall - the OD preamp tube was a tad higher than stock D'Lite. Here is a very sloppy clip of that amp going through the paces before I boxed it and sent it:
http://www.jonesin.org/Dave/JEamp.mp3
Forgive the playing. My right hand is in a splint - non-stenosing tenosynovitis. Tendon trouble especially in rt. ring finger

[jurgen]

jurgen,

I did check the voltages, but did not compare them. They were in line - I did not record them. If I recall - the OD preamp tube was a tad higher than stock D'Lite. Here is a very sloppy clip of that amp going through the paces before I boxed it and sent it:
http://www.jonesin.org/Dave/JEamp.mp3
Forgive the playing. My right hand is in a splint - non-stenosing tenosynovitis. Tendon trouble especially in rt. ring finger

Thanks Stell,

Bummer about the hand -clip sounds real good though

[stelligan]

Thanks Scott,

This is a verbatim D'Lite with just the 2 changes spoken of above. Different dropping string & FET sim + Bigger OT. Sounds like I am pushing Steve to implement these changes before he forges on, but I am just thinking 5 resistors and he will be grinning ear to ear.

[stelligan]

Steve,

I'd like to add again that your amp will likely sound stellar either way. I can tell by the picture that much care was taken in it's assembly. I used a power transformer from Antique electronics that was very similar to yours. I think the one in this build was a bit wimpier at 180ma. Since the original post added a request for suggestions, I thought that I would second the recommendation to change those resistors dogears mentioned. I have lived with my stock D'Lite for nearly a year and enjoy it very much. The addition of those changes in this latest build really was an improvement for me.

Keep us posted.

Dave

[sst4270]

Dave,

Between you and Dogears you've convinced me to make some modifications to this build.

On power board:
1k> 3k [edited]
22k > 15k
2.2k > 10k
220k > 150k

What else?

I understand the need for the correct type of shielded wire (<30pF/ft) unfortunately I don't know the rating for the cable I used.

Cable to MV: To shield or not shield? That is another question.

BTW: I enjoyed that clip that you posted very much. How was the delay added to the signal. Post record? Pre-amp-input? Or with effects loop?

The reason I ask is that once this amp is up and running I have built and plan to add-in the Iron Sounds Buffered Effects Loop that I've seen a few in this forum use... Any thoughts?

Regards,

Steve

[dogears]

Steve,

I use the 22K and 2.2k. Fwiw. YMMV.

Dave,

Between you and Dogears you've convinced me to make some modifications to this build.

On power board:
3k > 1k
22k > 15k
2.2k > 10k
220k > 150k

What else?

I understand the need for the correct type of shielded wire (<30pF/ft) unfortunately I don't know the rating for the cable I used.

Cable to MV: To shield or not shield? That is another question.

BTW: I enjoyed that clip that you posted very much. How was the delay added to the signal. Post record? Pre-amp-input? Or with effects loop?

The reason I ask is that once this amp is up and running I have built and plan to add-in the Iron Sounds Buffered Effects Loop that I've seen a few in this forum use... Any thoughts?

Regards,

Steve

[greiswig]

Okay, thanks sincerely for the help! I do trust dogears, as I *have* listened to the clips!

So here is what I'm gathering. This is the schematic for a D'Lite, and I've put what I think are the recommended changes in red text with arrows....Can someone tell me where I'm wrong?
[/img]

[Pete]

Okay, thanks sincerely for the help! I do trust dogears, as I *have* listened to the clips!

So here is what I'm gathering. This is the schematic for a D'Lite, and I've put what I think are the recommended changes in red text with arrows....Can someone tell me where I'm wrong?
[/img]

-Where you have "FET simulator" is NOT the FET simulator. What is termed the FET simulator is at the end of the "dropping string" (it is 220K, bottom right near what is labled HT+E).
-Slope resistor is correct.
-"470 ohm recommended" is NOT labeled correct, look farther to the right on pin 4 of the output tubes (labeled 1K 5W) this is what would normally be 470 ohm for 6L6.
-Where you have labeled 1K/47uf, components do not need to be changed, just the wiring.
-As per dogears' suggestion, the 1K in the dropping string should be 3K.

[greiswig]

Okay, thanks sincerely for the help! I do trust dogears, as I *have* listened to the clips!

So here is what I'm gathering. This is the schematic for a D'Lite, and I've put what I think are the recommended changes in red text with arrows....Can someone tell me where I'm wrong?
[/img]

-Where you have "FET simulator" is NOT the FET simulator. What is termed the FET simulator is at the end of the "dropping string" (it is 220K, bottom right near what is labled HT+E).
-Slope resistor is correct.
-"470 ohm recommended" is NOT labeled correct, look farther to the right on pin 4 of the output tubes (labeled 1K 5W) this is what would normally be 470 ohm for 6L6.
-Where you have labeled 1K/47uf, components do not need to be changed, just the wiring.
-As per dogears' suggestion, the 1K in the dropping string should be 3K.

Thanks, Pete. I updated the drawing per your input.