Metropoulos Forum

were there ever a 2k5 drake? I thought all were 4k or 1k7

Aha, a nibble ... cool Roe. Welcome ..yeah look to Park for more answers 2500 ohms is a magic number. From there the 100' s only saw 1750 ohms. 50' s had 3400 ohms

The other component Roe, as you know well,is the right power transformer. Its more critical than the otx here.

plexified wrote:Aha, a nibble ... cool Roe. Welcome ..yeah look to Park for more answers 2500 ohms is a magic number. From there the 100' s only saw 1750 ohms. 50' s had 3400 ohms

The other component Roe, as you know well,is the right power transformer. Its more critical than the otx here.

there newer was any 2k5 park transformer, except for the one ken fischer appears to have measured wrong or something. the OT is usually the single most important part in an amp. Fischer wrote:

"primary output impedance levels: -very early Marshall Plexis with Geneflex KT66's had very high plate voltage and 3200 Ohm plate load through two 50watt Partridge [drake 784-103] trannys, chassis were made of aluminum which affects fields of trannys and therefore tone ... forget about reproducing the sound of those plexis.

-primary impedance on the output tranny was around 2500 up to 1965 on main versions, [probably as reference to the 1202-84]

-following 1967 it went down to around 1750 Ohms with smaller output tranny [dagnall] and EL-34's, this gave the response a more raw and bitting quality. Best sounding are Parks at 2500 Ohms. "

http://www.lynx.bc.ca/~jc/KenFischer.html

Well to the JMP, it was missed and missed again.

Ken has more experience on this topic than most folks so his observations are accurate . So much so he had this topic nailed in all his writings, but more importantly his work every day for 50 years.

And I respectfully disagree. The power transformer can be more important and in this case is.

To be on this build you need vintage gear.

And to be fair wire gauge and quality alone can make an otx OR an ptx grab your ear or your balls by the short hairs.

please show me a 2.5k drake transformer and I'll believe you. one of Ken's friends, Chris ******, even said that Ken was probably just refering to the 1202-84: http://www.vintageamps.com/plexiboard/v ... =1&t=36796

Sure, why not send you a blueprint.

And you are?

Obviously, you don't know what your talking about and since that's the case frankly your insulting with your delivery.

If you have something to offer you too missed the importance of the power transformer.

Kens 50 years of experience is by far unmatched.

To question him at this point is your decision.

You go ahead and prove Ken wrong Roe.

I knew him for 30 years, and your no Ken Fischer Roe.

2500 ohms was a brilliant observation from the master.

Sorry you never had a Park, Narb, Kitchen or Marshall on your bench.

Not a schematic or amp people can pull out of ones ass or provide a blueprint.

Have Chris wind you one then or get the balls to do it yourself before you wine anymore.

Or better yet contribute to the thread.

I have spent ten years on a Trainwreck documentary still ongoing so your disrespect preceedes you.

Ken was one of the greatest persons you could have met in life and this disrespect is a sore spot with me, so I apologize in advance for my attitude.

Just kidding! No popcorn needed!

Roe and Plexified are both guys we want contributing here!

Interesting topic... let's figure this thing out!

Back in the late 80's......
Kenny and I pulled a strange 2" Drake OPT from a 67 plexi...
It had 4 bolts instead of the normal 2....
I measured it out to be 2.2K plate load and sounded amazing...I still have it....
It looks like the one in EVH amp...


c.e.r.r.e.m

Chris,could it have been a 1202-119 or -132 with a 2k2 Z instead of the ordinary 1k7?

I know the -119 and the -132 output transformers inside and out as well as the earlier -84 ...and I can say that this output is totally different...The 2.2K was accurately measured by myself..as well as the actuall turns inside matched up...transformer is still perfect working condition...
It is what I consider a fluke or possibly just a small purchase of something to get some amps off the bench and out the door...

c.e.r.r.e.m

the obvious questions is: can it be accurately reproduced?

of course it had to be unique

every single thing the guy touched was odd. try to accurately replicate the Frank, or any of his axes for that matter...

this will be an interesting thread. would be nice if it was compiled into the debate plexi thread.

Hold the Horses !!!
I was just pointing out how bizare this transformer is in the scheme of things and that is also looks coincidently very similair to the one in the EVH amp... Check out the link in previous post...

c.e.r.r.e.m

Wow, I always assumed that the OT in that pic was from the VHT Pitbull, but I zoomed in on it, and it looks exactly like the OT you have there Chris. Hard to say for sure, but I really want to try one of these.