A few more D'Lite questions

[markmalin]

Hey, guys. I'm working on this D'Lite and have come up with some questions. I'm using the "Rev 1.5" sechematic that's on Brown Note's forum, which I'm thinking you guys are all familiar with. So ... questions:

- this is the most recent version, right? I started poking through some of the color layout diagrams I had downloated from Normster's website and noticed there's a layout that doesn't show the 2 22M resistors adn the 0.05 uf cap between pin 6 and 7 on V1 and started getting confused.

- the other thing is, I plan to use 6V6's, so the OT I bought is a 22 watt. Is there anything I need to do differently from the Rev 1.5 schematic to run 6V6's? For instance, should I tie pin 1 and 8 together like in the schematic (different from Fenders)? Or.... are the resistor values correct for 6V6's, or do I need to change anything??

This has me somewhat confused, I'm not ashamed to admit! Any discussion you guys would care to share on this would be really helpful.

Thanks!
Mark.

[Structo]

The D'Lite 22 is made to run 6V6's with it's 8K pri OT.
The D44 can run either 6V6 or 6L6's with it's OT, since it has the dual primary windings of 4.4K and 8K.
I believe you can run the 6L6 power tubes on the 22 but you have to half the impedance values on the switch when you do it, ie. 4 8 16 become 2 4 8.
As far as the layout goes use this one.

http://www.brownnote.net/forum/viewtopic.php?t=329
I just built a D44 and followed that layout and everything is fine.
This layout has the two 22 M resistors in series with the .05 uF cap.
Did you buy a kit or are you sourcing your own parts?

The only problem I had was with the PT color coding.

[markmalin]

The D'Lite 22 is made to run 6V6's with it's 8K pri OT.
The D44 can run either 6V6 or 6L6's with it's OT, since it has the dual primary windings of 4.4K and 8K.
As far as the layout goes use this one.

http://www.brownnote.net/forum/viewtopic.php?t=329
I just built a D44 and followed that layout and everything is fine.
This layout has the two 22 M resistors in series with the .05 uF cap.
Did you buy a kit or are you sourcing your own parts?

Hey, thanks for the reply, Structo. That's pretty much the layout I'm using, but the version WITH the relays. (I found these all on thenormster's website). I wanted to put the relays in mine, hence the "relay" version of the layout.

I guess where it got confusing was in poking around the other layouts in the same directory on "bad-domain" I found a couple labeled "DumbleLite16x8Layout3.jpg". These ones have different values for the resistors on the output tubes, and they're laid out more like some of the Fender layouts on the amps that run 6V6's (Deluxe Reverb, 5E3, etc.). I started wondering... "oh, nuts. Am I using the correct layout for 6V6's? Is the schematic I used the correct one?!"

Anyhow, I sourced my own parts, so it's been a little less clear. I'm building the D'Lite 22 (22 watt version, 2 6V6's for output tubes). Sounds like the same schematic can be used for both the D'22 and 44, then, right? The only difference being the transformers?


Mark.

[Bob-I]

Hey, guys. I'm working on this D'Lite and have come up with some questions. I'm using the "Rev 1.5" sechematic that's on Brown Note's forum, which I'm thinking you guys are all familiar with. So ... questions:

It's really best to post the layout anyway. I've done so many amps, plus my memory isn't so.... what were we talking about?

- this is the most recent version, right? I started poking through some of the color layout diagrams I had downloated from Normster's website and noticed there's a layout that doesn't show the 2 22M resistors adn the 0.05 uf cap between pin 6 and 7 on V1 and started getting confused.

That's the Local Negative Feedback loop (LNFB). It's optional. I made it switchable on the amp I built in a Princeton chassis(I like to think of it the first D-Lite ). My switch has 3 positions, 22M/off/44M. I find that I like it at 44M or off best.

- the other thing is, I plan to use 6V6's, so the OT I bought is a 22 watt. Is there anything I need to do differently from the Rev 1.5 schematic to run 6V6's? For instance, should I tie pin 1 and 8 together like in the schematic (different from Fenders)? Or.... are the resistor values correct for 6V6's, or do I need to change anything??

This has me somewhat confused, I'm not ashamed to admit! Any discussion you guys would care to share on this would be really helpful.

Thanks!
Mark.

On 6V6's pins 1 and 8 are tied together internally, but not on KT-77's or EL-34's. There's no harm in having them tied and gives you the flexability to try other tubes later.

Good luck

[markmalin]

Thanks for the help, and the explanations. This is really helpful.

I probably should have posted the two layouts -- I haven't figured out how to post pictures yet, but I would like to do that so I can understand the differences between the two different sets of resistor values on the power tubes.

Anyhow, thanks for explaining the reason for pins 1 and 8 being wired different ways. The tube data sheet I looked at just had both as no connects (or maybe I wasn't looking carefully enough!).

Thanks also for the explanation on the local negative feedback loop circuit. Is your switch internal or external, then? You mention you like 44M or off, what are the differences? more or less sustain? Tone?

Thanks for all the help!
Mark.

[Structo]

Some of those pictures and layouts on Norms site are his early versions and prototypes when they were ironing out the final Brown Note design.
Even on the assembly guide I noticed there were some discrepancies in the photos particularly around V1.
I just followed the final layout that I posted and everything worked fine.
I did purchase a kit though.....

It was my first tube amp build so I wasn't up to the task of sourcing my own parts especially the xformers.
The new BN PT is 300 mA so it will make running even EL34's doable.
Plus the OT has dual primaries with 4.4K and 8K so I wired a DPDT switch on those so I can run both the 6V6 and 6L6 type tubes with a flick of a switch and rebias.

For posting pictures I use www.photobucket.com
It's free and easy.
I make sure to choose the 640x480 option by the upload window so it doesn't crowd forums too much but that setting won't allow very good detail on a layout or schematic.

With photobucket you can also use clickable thumbnail pics as well so that may be the best option for large pictures.

[Bob-I]

Thanks also for the explanation on the local negative feedback loop circuit. Is your switch internal or external, then? You mention you like 44M or off, what are the differences? more or less sustain? Tone?

Thanks for all the help!
Mark.

I have a 3 way toggle for the LNFB, position 1=22M/.047uF, position 2=off, position 3=44M/.047uF (series 22M resistors). I find that the LNFB takes away some of the gain, and fattens up the tone with some lower mids. I use it mostly in the 44M position, 22M is just too much gain loss.