Dean Markley T120-R fixer-upper project.

[mondogenerator]

Ta Stephen, I had pretty much arrived at the same conclusions as yourself Vis-a-vis capacitors:

1 of 22uF 500V A right royal Pain to find!!!!
2 of 100uF 350V VISHAY SPRAGUE|53D101F400JL6|CAPACITOR, ELECTROLYTIC, 400V | Farnell United Kingdom

(bloody expensive! only other options involve paying £15 swhipping charge per order from US!!!)

2 of 33uF 350V Buy Aluminium PEG124 axial Al electro cap,33uF 450V Evox-Rifa PEG124YJ2330Q online from RS for next day delivery.
3 of 100uF 80V Buy Aluminium PEG124 axial Al electro cap,100uF 100V Evox-Rifa PEG124PF310VQ online from RS for next day delivery.
2 of 470uF 25V (radial) RUBYCON|25YXF470MEFC10X16|CAPACITOR, 470UF, 25V | Farnell United Kingdom


1 of 1uF 50V (radial) RUBYCON|50ML1MEFC4X5|CAPACITOR, 1UF, 50V | Farnell United Kingdom
1 of 22uF 350V Buy Aluminium PEG124 axial Al electro cap, 22uF 450V Evox-Rifa PEG124YH2220Q online from RS for next day delivery.


Since I work in power conversion, (commonly converters use 690VDC in DC link feed, and required Cap filtering) I may ask some of the purchasers, for a source for the 500VDC 22uF, and 350VDC 100uF, just to see if they know any other vendors that I am not aware of (RS,CPC,Farnell are about all) with any luck I may find something suitable. Pity they HAVE to be polarised, since I could get hold of PP caps for these values very very easily

[StephaninMelb]

Your selection of caps does closely match mine. I like the Peg124 better than Sprague but as we both saw they don't make that one value. I thought that 470uF 25V was a radial. I bought my Evox Rifa from RS Components in Australia. I think I also used the Rubicon radials in those values.

After I soldered the axil capacitors in place I then put a dab of clear silicon between the caps (at the top edge) to add stability.

[mondogenerator]

Originally Posted by StephaninMelb

After I soldered the axil capacitors in place I then put a dab of clear silicon between the caps (at the top edge) to add stability.

yeah the originals are hotmelt glued together, and I have a glue gun so may well go with that.

On the Pot front, 1Meg vertical mounts are hard to find....

I have one possibilty though:

VISHAY SFERNICE|P10XXAI105KB30|POTENTIOMETER, 1M | Farnell United Kingdom (although log track)

also for 250k (although Lin NOT log )

BOURNS|91A1A-B28-B22L|POTENTIOMETER, 250K | Farnell United Kingdom

[StephaninMelb]

F&T, Illinois and Sprague I saw were available from Triode USA. I will see if any of the amps parts vendors in UK have any alternatives.

[StephaninMelb]

Have you checked for source of Peavey spider vertical mount pots in UK. The other vertical mount pots were not long enough to clear the enclosure. The Dean Markley pots are unique how they have that long casing around the shaft and then threaded on outer section. The Peavey spider pots reverse the vertical mount where the pot fits against the back of the enclosure and then uses the long legs to reach the board.

[mondogenerator]

Haha thanks, Im going a bit crazy here

Although im considering just using panel mount pots, and extending the 'legs' with flash wire (just copper wire without the enamel coating)

I had a quick look at the Peaveys...i cant recall if they covered ALL the values necessary though....Also the 'master' and 'Presence' pot values arent shown on the DM schematic, and I cant recall if you listed them on your site (sorry), so they could be a problem too. One thing is that the single support leg of the Peaveys will foul a track, on at least one of the positions.

One the bright side, I have mailed DM support, and theyve directed me to an engineer they use, for a FULL schematic!

Some of the Bourns, and a few Vishays types have very long 'legs', and I reckon I could just bend them to orientate the pot vertically

[StephaninMelb]

22uF 500V electrolytic
100uF 350V electrolytic

F&T available in these values for 2.95 pounds / each from HotroxUK:

http://www.hotroxuk.com/amp-parts-service-equipment-294-0/capacitors-mallory-caps-sprague-orange-drops-6136-0/f-t-axial-lead-caps.html

Sources for Peavey spider pots:

http://www.stagebeat.co.uk/?page_id=500685

[mondogenerator]

Brilliant!

Google must like you more than I lol

Here the pic showing PSU board and the pre board:



One option is still open to me WRT the pot issue.

I could use a piece of insulating GRP (plenty at work lol), on stand offs, and mount pre board horizontally.

Whatever I do, the pots present a further issue. BOTH the legs are used in the circuit continuity, to for the ground(?) path, so whether I use the Peavey pots or others, Ill have to sort that issue as well lol.

[StephaninMelb]

I had thought of mounting the preamp PCB using L brackets behind the board with PC type stand-offs. Then using conventional panel mount pots and running insulated leads to the board.

[StephaninMelb]

I would just cut off the legs of the current pots leaving the board side of each leg sticking out the PCB as solder points and go for panel mount pots. Then find a way like the L brackets and stand-offs to mount the whole board vertically. It looks like there is plenty of room and should be no issue drilling holes in the enclosure floor for screws.