Latest (Last?) Amp + D-lator Pictures

[pazzo63]

fantasic work!!!what is the right value for the filament resistors?150 ohms or 75 ohms for late 80 amps?thanks in advance

[ayan]

fantasic work!!!what is the right value for the filament resistors?150 ohms or 75 ohms for late 80 amps?thanks in advance

I have always seen and used 150 ohms, in cases where there is a diode and 390 ohm resistor to derive the LED voltage as well. Fender used 100 ohms.

Gil

[martin manning]

Hey, what is the small board with the trimmer and cap on top of the main board? Is it for this particular species of D amp, and does it show on a schematic somewhere?

MPM

[ayan]

Hey, what is the small board with the trimmer and cap on top of the main board? Is it for this particular species of D amp, and does it show on a schematic somewhere?

MPM

That's just a tone control for the overdrive in non HRM amps. I use a 250K pot (wired as a variable resistor) in series with a .001uF cap and conect that between the output of the overdrive (i.e., at the junction of the 150K resistor and the 100KL "Ratio" pot) and ground. Systematically, I set that about 100-120K to ground. Before anyone jumps in and says somethign about losing too much of the highs or anything else, I will remind you that I use 330pF ceramic discs at the OD tube socket (plate to cathode) and I do use a 30pF brightness cap across the amps master volume. If you don't use that cap, or use larger "puffs" at the sockets, or use a 180K resistor at the output of the overdrive instead of a 150K one, you may not need to bleed off any highs to ground at all.

Gil

[Guitarman18]

Gil, thanks for the answers. There is one other mystery that you may be able to solve.... On the non-HRM schem in the files section it shows a 100K resistor connected between the wiper of the master vol. and the preamp out jack. Have you got this resistor in there (if so, whereabouts?)or have you got the 220K + 250pf cap as in #124 or something (nothing ) else?

As always, many thanks for all your help and I'd have to say that it is a good thing for the rest of us that you are not retiring from the garage. Besides, you'd miss all the excitement and drama that unfolds on a daily basis.

Cheers,

Paul.

[dogears]

Paul, I have never seen that 100K resistor. I'd ignore its existance. I believe it may have been an Ahola addition?? Not seen in the Dumble.

Gil, thanks for the answers. There is one other mystery that you may be able to solve.... On the non-HRM schem in the files section it shows a 100K resistor connected between the wiper of the master vol. and the preamp out jack. Have you got this resistor in there (if so, whereabouts?)or have you got the 220K + 250pf cap as in #124 or something (nothing ) else?

As always, many thanks for all your help and I'd have to say that it is a good thing for the rest of us that you are not retiring from the garage. Besides, you'd miss all the excitement and drama that unfolds on a daily basis.

Cheers,

Paul.

[Guitarman18]

dogears wrote:

Paul, I have never seen that 100K resistor. I'd ignore its existance. I believe it may have been an Ahola addition?? Not seen in the Dumble.

I'm glad you said that dogears, I could swear it wasn't there when I first looked at ODS -101. At least the solder fumes haven't caused as much brain cell damage as I first thought.

Cheers,

Paul.

[ayan]

Gil, thanks for the answers. There is one other mystery that you may be able to solve.... On the non-HRM schem in the files section it shows a 100K resistor connected between the wiper of the master vol. and the preamp out jack. Have you got this resistor in there (if so, whereabouts?)or have you got the 220K + 250pf cap as in #124 or something (nothing ) else?

As always, many thanks for all your help and I'd have to say that it is a good thing for the rest of us that you are not retiring from the garage. Besides, you'd miss all the excitement and drama that unfolds on a daily basis.

Cheers,

Paul.

Paul, I have nothing at all in the loop in my amps. The 100K trick sounds like a Kevin O'Connor thing, done to isolate the effect of the master volume setting on the low end content of the amp (louder = more bottom end). I never saw the need to do that, personally.

Gil

[Structo]

Great looking amp as usual Gil.

Is that a MOV on the power switch?
If it is, can you tell me about the specs?


Back to the ceramic discs on the rectifier board, is that a worthwhile thing to do?
I have a D'Lite 44 ( 2 x 6L6 ) that seems to have quite a bit of hash when the volume and master are way up, could that be switching noise I am hearing?

Thanks

[UltraHookedOnPhonix]

...or use a 180K resistor at the output of the overdrive instead of a 150K one, you may not need to bleed off any highs to ground at all.

Curious Gil, are there real Non-HRM specimens out there that use a 180K instead of a 150K?

[dogears]

Yes. Several. I have pics. I use 180K fwiw.

...or use a 180K resistor at the output of the overdrive instead of a 150K one, you may not need to bleed off any highs to ground at all.

Curious Gil, are there real Non-HRM specimens out there that use a 180K instead of a 150K?

[ayan]

Great looking amp as usual Gil.

Is that a MOV on the power switch?
If it is, can you tell me about the specs?


Back to the ceramic discs on the rectifier board, is that a worthwhile thing to do?
I have a D'Lite 44 ( 2 x 6L6 ) that seems to have quite a bit of hash when the volume and master are way up, could that be switching noise I am hearing?

Thanks

Thank you. The thing on the standby switch is yet another .01uF 1KV ceramic. As for the caps on the rectifierr board, I can’t say how that compare to not having them there, as I have always put them in my amps. If it helps, I believe equipment that needs to be CE certificied must have the caps. Rivera put them in his Fenders back in the early 80s, probably one of the 1st Americans to start doing so as far as I am aware.

...or use a 180K resistor at the output of the overdrive instead of a 150K one, you may not need to bleed off any highs to ground at all.

Curious Gil, are there real Non-HRM specimens out there that use a 180K instead of a 150K?

I know of a couple of such amps. By a wide margin, the majority of the ones I have personally seen have had 150K there. If I didn’t have the treble bleed stuff, I would need to use something higher than 150K, especially in the 100K plate load amps. What I am not so crazy about with the 180K resistor is that you lose a bit of volume in the overdrive channel, which would require setting the “Ratio” control higher. For someone as anal retentive as I, wherer the chicken knobs end up pointing does matter.

Gil

[Structo]

Are you guys talking about the 180K on V2b?

[UltraHookedOnPhonix]

No, this is the 150K resistor that goes before the "Ratio" pot. Seems the D-man used 180K there sometimes on Non-HRMs.

[makrisp]

Hi guys,

Been really busy this year but managed to finish another amp and an accompanying Dumbleator clone. Here are a couple of pictures, in case they can help anyone. There is nothing new here, this is a backup for my main amp, a 100K plate, non HRM, almost identical to #124 and another D-lator clone, since I sold one each a while ago.

Cheers,

Gil

Gil,

Nice Stuff!