Crack;Bottlehead OTL
Nov 4, 2019 at 4:41 PM Post #9,766 of 12,335
Have you installed the Speed Ball?
Then with SB upgrade the pair of wirewound resistors were removed, and I believe the plate temp dropped significantly.
The heat dissipated under the chassis goes up when the Speedball is installed.

The localized heating of the chassis plate right where those 10W resistors sit will decrease when the Speedball is installed.

(Always remember to install the rubber feet too)
 
Nov 4, 2019 at 9:53 PM Post #9,767 of 12,335
The heat dissipated under the chassis goes up when the Speedball is installed.

The localized heating of the chassis plate right where those 10W resistors sit will decrease when the Speedball is installed.

(Always remember to install the rubber feet too)

I don't have any equipment to test the temperature, but I think the temp on Crack w/ Speedball is okay, the plate just feels warm, but never hot.

I am not sure if SB will increase or decrease the temp, but I think the 2 dissipators sitting on top of the SB board help to dissipate heat to the air around them thus reduce the heat conducted to the plate like the wirewound resistors do. So it could give me a biased impression that SB reduces the plate temp.
 
Nov 4, 2019 at 9:58 PM Post #9,768 of 12,335
The large Speedball board heatsinks dissipate the same amount of heat as the 3K resistors do, but both the large Speedball board and the small Speedball board have some additional current flowing through them to permit the current sources to operate, so the overall heat dissipated inside the chassis is a bit higher.

The Speedball boards are not as close to the chassis, so what would be heated locally by the 3K resistors is a bit more spread out to the entire chassis after the modification.
 
Nov 11, 2019 at 12:32 PM Post #9,769 of 12,335
I scooped a 'Zaerix' branded power tube from ebay, suppose to be a 6as7g.

Look familiar to anyone? I wonder what its parent company is!
1107191737.jpg
 
Nov 11, 2019 at 5:20 PM Post #9,771 of 12,335
I scooped a 'Zaerix' branded power tube from ebay, suppose to be a 6as7g.

Look familiar to anyone? I wonder what its parent company is!


Buddy, this is 100% a Svetlana 6H13C or 6H5C from Russia, I have couple of these as well.

Did you see the 2 flying UFO getters right above the base, it is a telltale of Russian tubes.
 
Nov 11, 2019 at 5:30 PM Post #9,772 of 12,335
You can often find lots of rebrands of Svetlana 6H13C/6H5C, sometimes they are rebranded as Hytron, Mullard, and even GEC, and asking for a premium for them, but really they're just Russian 6H13C/6H5C and are not worth that much. Hope you didn't pay big bucks on the 'Zaerix'. You can easily find Svetlana 6H13C/6H5C for $8 - $15.

That said, Svetlana 6H13C/6H5C is a decent tube, it sounds much better than the crappy RCA 6080.
 
Nov 11, 2019 at 5:35 PM Post #9,773 of 12,335
Nice! Is it the ssame as the Winged C? I paid $28 for it to be shipped overseas. It's not a bad tube, though there are aspects about my RCA 6080 that I like more than the Zaerix that keep the RCA installed.

Those 2 space-plates are funny looking! They just kind of dangle there.

I'm really curious of the RCA 6AS7G.
 
Nov 11, 2019 at 5:44 PM Post #9,774 of 12,335
Nice! Is it the ssame as the Winged C? I paid $28 for it to be shipped overseas. It's not a bad tube, though there are aspects about my RCA 6080 that I like more than the Zaerix that keep the RCA installed.

Those 2 space-plates are funny looking! They just kind of dangle there.

I'm really curious of the RCA 6AS7G.


Yes, it is the same as Winged C. Svetlana's logo has a big C with wings, so it's called Winged C
Svetlana%20winged%20c%20Logo%201.jpg



Some people like the RCA 6080s, especially if they're mainly on vocal albums. RCA is famous for its warm mids - good for vocals for sure. But I really don't care for it, lack of details and soundstage, really nothing but warm, YMMV, LOL.

RCA 6AS7G sounds similar to RCA 6080, I have both, and neither of them grabs my attention, LOL :dt880smile:
 
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Nov 12, 2019 at 8:32 AM Post #9,775 of 12,335
Tung sol, makes really good power tubes for the crack, and is my recommendation.

Tung Sol - 6080 and 6AS7G, are all really good power tubes, in the crack.
 
Nov 23, 2019 at 11:13 PM Post #9,777 of 12,335
Have to cut each character out (Attack on Titan) and play with arrangement. Probably have Mikasa in the front with the bottlehead badge.

Does anyone have recommendation how i should apply these decals? I was thinking of letting the polyurethane dry, then using a gluestick on the decals, then apply...
1123192006.jpg
 
Nov 27, 2019 at 3:47 PM Post #9,780 of 12,335

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