The Amp Garage

Hi Sluckey. At some point I started to do that to any and all OT's that came this way, did the winding ratio's, impedance ratios, and then divided into primary impedances, 4K and 8K usually, just in case I even decided to change tubes or a different speaker. I realize the the DCR isn't very helpful ...

I just did another sanity check, used both my Fluke DMM and then my Fluke benchtop just to up the confidence on what I was seeing and yup, in both cases the Green to Yellow have a DCR about 30% greater than Yel/Blk and Grn/Blk. To be specific: Yel/Blk = .7 ohm Grn/Blk - .7 ohm Yel/Grn = 1.0 ohm On t...

Then this happens! I"m sure there is a simple answer but, I sure don't have it tonight. I'd love to hear any of your takes on this little debacle I ran into with my Allen amps Heyboer TO35MT output transformer. I am upgrading a RobRob Blackvibe 6L6 to a more complete blackface vibrato/reverb channel...

Ah OK, thank you for that explanation. It makes alot of sense that average DC is going to decrease as ripple increases, as well as current increasing as larger capacitance is opening up the reservoir for more electrons to freely flow. I think that's it. So what I think I'm getting is that should you...

Hi Martin, thanks. Can you give a brief explaination of how enlarging or adjusting the cap would alter the measured DC voltage across the heaters? The only way I have understood a circuit similar to this one is that the ripple continues to decrease as the cap value is increased, or if maybe smaller ...

Thank you Martin,

This looks good, and very simple to put together.

I think I shall give this a go. I like that it skips having to employ voltage regulators and such as the pcb I have does.

thanks again!

Best,
Phil D.

Hello, hope ya all had a great T-day. I suppose its time to get ready to set up for DC filaments in a 2204 type circuit with JEL mods. I assume that noise ought to be something to consider minimizing and seeing that there is no centertap on the heater coil I should probably think about giving the DC...

Its not VooDoo.

It is Electrical Alchemy.

PJD3

I guess guitar amp builders should be grateful that they don't have to contend with RF. An electrical engineer for whom I do a lot of tech work for called me over to see a few scope traces yesterday. One trace was the clock pulses coming directly from the IC pin. The second trace was that same same ...

Thank you that explanation RG. Of course, the Mosfet would be bolted to inside of the chassis right next to the power ground using the chassis as the main heatsink that is using thermal grease and also, i will be getting those clips that you recommended and like. They seem like a great addition and ...

Just curious,

Would it be ridiculous or at minimum, useless to place a heatsink on the opposite side of the chassis where the Mosfet is screwed into? Just had to wonder if even a little heat could be mitigated away from the chassis into the air outside the chassis.

Phil D.

Its funny, The local amp tech here in the north Boston area, who actually has some pretty big guitar names personally drop their amps off to him swears that part the reason old Fenders have a sound that is really special, is due to the fiberboards introducing all of these electrical characteristics ...

Ha, thats great Max.

I have from time to time imagined electron flow in strange analogous ways to give some visual to the actions.

"But, to truly know the electron, you must "Be" the electron" - Bruce B+

Semi-sincerely yours,

Phil D.

Thanks for explaining that Max. I do like the added electrical robustness of these in power and voltage. Sounds like just a matter of getting a good number of them, testing them for ranges, and working up a little method of getting them securely fixtured for reliable/consistent performance. I'm a li...

Thanks for showing these max.

How did you interface these with an LED in terms of mounting and distance apart?

Thanks,

Phil