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In Reply to: RE: Pinging Chip 647 re D70 II posted by dgaapc7 on August 30, 2024 at 14:03:27
Yugoslavian but tooled on acquired Telefunken equipment. Made for Audio Research and others, including guitar amp manufacturers like Marshall.
No experience with either the Telefunken or EI in that position.
I have the D-70 MK1.
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
Follow Ups:
The D 70 is a great amp, isn't it? With it driving the mids and highs and that big-ass 462 on the bass, the music really sings.
I ordered some EI ax7s years ago that had bright silver smooth plates. They sounded good, but of six I ordered, I think it was six, several did not last very long. Those that did were quite good. I had no qualms about putting them in a preamp I sold.
LowIQ
The amp is amazing. Besides the mids and highs it also brought the bass to a level in my Quads that I put any thought of a sub to rest.That's some system you have. Biamping with those amps quite the combination.
I only have one 12ax7 in my amp, branded Baldwin. Never tried a Yugoslovian there though have the 4 6dj8's I mentioned in another post in this thread.
The D70 was a favorite of Kent's of ElectroStatic Solutions. He ran EI KT90's in it instead of 6550's.
It's great to hear there's still some interest in that amp.
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
Edits: 09/05/24
Thanks for the compliment re my system. A list of the components I went through would be an arm long. I think there is still some interest in the D70 since they don't seem to hang around long on the used market. Kind of like Quicksilver- if you want it better grab it cause someone else will.
At least the other day there was a pair of M 100s at a very reasonable price, I think on eBay. I thought about them since they are in the same family as the D70, but I thought it would be overkill.
Have you maybe tried both KT 88s and 6550s for your amp? If so, any comments? I've only heard with 6550s. If so, would appreciate your assessment.
LowIQ
Good point about the Quicksilvers. Never heard them but wouldn't hesitate to purchase without hearing if my amp ever gave up the ghost.Almost bought a quad of Genelex KT88's to try. Were on special at a dealer recently. But while browsing around other sites I came across and purchased a quad of the older Svetlana SV6550C at an even better price so grabbed them instead to keep as spares.
The Winged C St Petersburg with Square holes, either SED or older Svetlana, are really all that I've ever tried other than what appeared to be the stock tubes the amp came with when I purchased it 2nd hand a couple of decades ago.
I also picked up a pair of RCA 6550's in the Spring. Want to give one a try in that 5th position. I didn't realize how much of a difference that single tube made on the overall sound until I tossed a new 6550WE in there and it was not to my liking so went back to a winged C. Never know until you try I guess. Unfortunately I am way way behind on tweaking and best intentions still sitting in boxes.
I'll be sure to post any updates.
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
Edits: 09/05/24
They have Philips codes on them.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
NT
"I know just enough to get into trouble. But not enough to get out of it."
.
Have Fun and Enjoy the Music
"Still Working the Problem"
Yup. Sorry, I should have said they have Philips date codes indicating the EI Plant.
I had forgotten I had looked the codes up years ago to confirm. Quite smudged now and somewhat obstructed by the branding.
Thanks for the additional info on the Philips tooling. I had only come across that Philips supervised the process and that was it. Makes more sense now.
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
All of these are Philips date codes.
.
Have Fun and Enjoy the Music
"Still Working the Problem"
I'll have to double check my Sylvania 6DJ8's. I don't recall any codes on them. They are A Frames and also came in a Sylvania sleeve pack in the 80's.
Will pull the amp out on the weekend.
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
their ok but in a guitar amp are or become microphonic. It happens in a full tilt Marshall. They sound very nice though
Have you tried Telefunken 12ax7? Did they become microphonic?
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
they have a great sound too. Even the ribbed plate.
They made great tubes back then, no doubt, when I was a wee lad, of course
Thanks Jonesy-
I had forgotten about the EI 12AX7s
they were a good tube and were readily available till the Yugoslavian break-up/war.
and Yes, old German tooling.
Happy Listening
4 of the 7 6DJ8's I use in my amp are made in Yugoslavia, branded Sylvania. They have served me well all these years. Don't know much about the tooling other than it was supervised by Philips.
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
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