Edcor UL

[C Moore]

http://www.edcorusa.com/products/448-cx ... -4_2k.aspx

Is there any problem with using the above OT in a BF Fender Bassman head.?
Can I just safe-off the screen taps and be on my merry way.?
Thank You

[ToneMerc]

No, yes do exactly that.

TM

[David Root]

Great choice! I hope you're using speaker(s) that can do justice to it. These are superb OTs.

[C Moore]

Great choice! I hope you're using speaker(s) that can do justice to it. These are superb OTs.

Well..... the OT is going in a friends Bassman. I stripped the amp down to bare chassis, and reused only the PT, Choke, and tube sockets. He bought the amp with a Heyboer OT. After rebuilding the amp with all new parts, there was an odd static/distortion as the notes peaked and then decayed. It was worse on "lower" notes and chords.
I replaced the old fiber boards with a fiber glass, turret board from Angela.......only to find the amp STILL had the same issues. I just refused to believe that "new" Heyboer OT was to blame. I substituted an OT from one of my Bassman heads and the problem was gone......the Heyboer was bad.
My friend was the second owner of that OT, so who knows what the first guy did to it.......dropped it in a bathtub, HUGE impedance mismatch, stuck it in a microwave oven perhaps.....?.....who knows.
My friend is using an old Bassman 2x12 (huge cabinet) with Vintage 30's.
I did A LOT of work to this head.....including switchable cathode values, and plate, slope, and tone stack value changes to the first channel. It turned out REAL nice (with help from you guys of course).....was a shame I spent so much time and effort avoiding that OT. I just assumed, that with a head I stripped bare, I must have made a mistake somewhere. How often is the OT bad.? Especially a new OT from Heyboer. 20/20 hindsight.....I should have swapped that OT A Lot sooner.....seeing how it was a "used" part. Live and Learn.
Long story.....sorry.
So I am looking at OT from:
1. Edcor
2. Magnetic Components
3. Hammond 1760L
One Again.....Thanks for all the help I got from TAG.!

[gldtp99]

I like Edcor iron---- i'm using an Edcor PT (XPWR109) in my current build (50 watt channel switcher).
But this Mag comp OT is one of my favorite OT's of all time--- i've used several in builds/conversions/replacements---- it's one sweet sounding piece of iron, IMO: http://www.classictone.net/40-18001.html
It's Mag Comp's upgrade 50/60 watt Fender OT with 4/8/16 ohm output taps. I recommend it.
My current 50 watt build uses a Mercury Magnetics 50 watt Marshall modern-type OT---i have output taps jogged to put 6.6k ohms on output plate-to-plate load----using Chinese Blackplate 6L6's (GT version)--- the clean channel is a version of the Fender 6G7A Brownface Bandmaster Normal channel---- except using two 12ax7's (RCA 12ax7a's) wired in parallel for the preamp gain stages instead of a single 12ax7----circuit components adjusted accordingly to give fat, rich cleans up to 12 noon on clean vol pot.
This Merc Mag modern Marshall OT works great for the clean tones but i chose it mostly for the hi-gain lead channel------ the 6L6's running at 6.6k (or 6.8k--- whatever) also work just fine for the hi-gain channel---- lots of experiments (for me) contained in this one build---sounds very impressive.
But i'm now wondering what the Mag Comp 40-18001 OT would have sounded like in this build ? Just as good? Better ? Who cares? ---- actually the amp sounds very, very good as is and the lead channel voicing/filtering/OT are tailored for dropped/low tuning--- has very impressive Thump for a 50 watter !!!
Again, for a stock Fender-type amp i recommend the Mag Comp 40-18001 OT..........................gldtp99

[marcoloco961]

I like Edcor iron---- i'm using an Edcor PT (XPWR109) in my current build (50 watt channel switcher).
But this Mag comp OT is one of my favorite OT's of all time--- i've used several in builds/conversions/replacements---- it's one sweet sounding piece of iron, IMO: http://www.classictone.net/40-18001.html
It's Mag Comp's upgrade 50/60 watt Fender OT with 4/8/16 ohm output taps. I recommend it.
My current 50 watt build uses a Mercury Magnetics 50 watt Marshall modern-type OT---i have output taps jogged to put 6.6k ohms on output plate-to-plate load----using Chinese Blackplate 6L6's (GT version)--- the clean channel is a version of the Fender 6G7A Brownface Bandmaster Normal channel---- except using two 12ax7's (RCA 12ax7a's) wired in parallel for the preamp gain stages instead of a single 12ax7----circuit components adjusted accordingly to give fat, rich cleans up to 12 noon on clean vol pot.
This Merc Mag modern Marshall OT works great for the clean tones but i chose it mostly for the hi-gain lead channel------ the 6L6's running at 6.6k (or 6.8k--- whatever) also work just fine for the hi-gain channel---- lots of experiments (for me) contained in this one build---sounds very impressive.
But i'm now wondering what the Mag Comp 40-18001 OT would have sounded like in this build ? Just as good? Better ? Who cares? ---- actually the amp sounds very, very good as is and the lead channel voicing/filtering/OT are tailored for dropped/low tuning--- has very impressive Thump for a 50 watter !!!
Again, for a stock Fender-type amp i recommend the Mag Comp 40-18001 OT..........................gldtp99

Sweeeeeeet sounding metal amp. A+++

[gldtp99]

Thanks----- no demo clips of this one yet----- i'll soon have some new demo clips posted of some single channel builds that led up to this one (hi-gain 50 watters of different designs)----waiting on the mixes to come back from the studio.
After i get this channel switcher preamp finalized, i'll do some higher wattage builds with this preamp---also with No Loss FX Loop and switchable 2nd Master Vol.--- Optical switching coming soon, too (relay switching now)
Planning both 6L6GC x 6 and KT88 x 4 build experiments---the full sized versions should be impressive and have that depth of tone that a 50 watter just can't do---this latest 50 handles hi-gain low freq passages better than any 50 i've ever played (yes, even better than a DR504 w/pedals), but it's still a 50---i have the parts on hand---just need the time..................gldtp99

[C Moore]

gldtp99 ......
Yeah, that is the Mag Comp OT I was considering. I have used a few of their 2x6V6......2xEL84 type OT's in the past with no complaints from the owners. The price of their products is also very attractive. So attractive, that it makes you wonder......
Would you EVER recoup the money spent on a PT-OT from Mercury Magnetics.? Almost impossible to say on products that are in place for 30+ years without any kind of maintenance necessary. With Edcor, Hammond, Heyboer, and Mag Comp......I do not ever see myself paying for a Merc Mag tranny......
Best

[gldtp99]

Yes, the Mag Comp iron is a great value----i've been using the AES/CE versions for yrs--- even back when the online "experts" considered them cheap, inferior, etc and wrote that Merc Mag was the only upgrade game in town---i have two Merc Mag modern Marshall OT's--- but i got great deals on them and have been waiting for the right build to try one out for quite a while---the Merc Mag OT's look very well finished and this one sounds great in this application--- but i agree that i don't want to go through their process of buying enough units to eventually get to a somewhat reasonable price.
The Edcor OT's i've used in builds have worked well (and continue to do so)---- the only thing i've noticed with their OT's is that, for some tube guitar amp circuits, is that they may be "too good"---meaning very accurate and not adding or taking away from what is presented to them (for many this would be the very definition of a great OT)---in one Hiwatt DR103 clone build (using Edcor PT and OT) i had to tweak the NFB and circuit to get, what i consider, "Hiwatt tone" (i have a '72 Hiwatt DR103 and have done conversions with amps using real Partridge iron to test against--- as well as using the Heyboer Partridge clone iron in 50 watt Hiwatt circuit builds) but everybody, including the current owner, loved the tone of the amp------in a 70's Orange OR80 clone i built (w/Edcor OT) i added some extra "hair" to the circuit when building and this one now belongs to the recording studio across the hall from my shop---- they like it very much------ both these amp designs seem well suited to what i would expect from an Edcor OT (hi-fi-type tone from the Hiwatt and oversized iron in the Orange 80 watter)---also a 100 watt modern hi-gain circuit would probably sound very, very good through an Edcor OT---clarity, detail, accuracy, and great build quality.
But for vintage Fender-type sweetness i'd choose the Mag Comp 40-18001. Heyboer iron is also a great choice and they will custom wind almost anything--- i'm very happy with my experiences with Heyboer.
i think we're lucky to have such a choice of excellent iron to build amps with these days......................gldtp99