D3A Pentode as drive?, history of this tube?
I ran across this schematic of a parallel 2A3 with a D3A as a driver (Redrawn from Audiodesignguide.com)....I can't seem to find any info on this tube!
Most of the more "common" tubes have entire colorful histories associated with their development. This D3A I can't find anything..what was it used for , when did it first come out et al.
_______________________________________Rick..........
I ran across this schematic of a parallel 2A3 with a D3A as a driver (Redrawn from Audiodesignguide.com)....I can't seem to find any info on this tube!
Most of the more "common" tubes have entire colorful histories associated with their development. This D3A I can't find anything..what was it used for , when did it first come out et al.
_______________________________________Rick..........
Attachments
Oh come on, you can't tell me that you searched. There's a whole thread about that tube and a PCB for it!
D3A German Post Office pentode, probably developed in the late 1950s. Good parameters when triode connected. Made by Siemens & Halske as well as by Philips (or might have been a relabel?)
I use these in my phono stage where their very high transconductance, low rp, and a mu of 77 triode connected is just about ideal. (Triode connected their internal noise is about equivalent to a 68 ohm resistor.)
They also effectively drive the 300B/50/2A3 and as long as A2 operation is not required will also drive a GM70.
I use these in my phono stage where their very high transconductance, low rp, and a mu of 77 triode connected is just about ideal. (Triode connected their internal noise is about equivalent to a 68 ohm resistor.)
They also effectively drive the 300B/50/2A3 and as long as A2 operation is not required will also drive a GM70.
kevinkr said:
60 Rubles a peace, about $2. Plus shipment from Russia. Let's try to collect info about a group buy, you have my e-mail address.
Count me for a half dozen. What pinout? D3A or different?
I got a handful of 6CU5, but no curves as Triodes (yet).
Not quite the same thing, is it?
I got a handful of 6CU5, but no curves as Triodes (yet).
Not quite the same thing, is it?
Try to check this out on eBay. I don´t know about customs and adds when shipping from Ukraine to the US. The prices on eBay are pretty much spot on the 2 $ / tube as Wavebourn wrote.
http://shop.ebay.com/?_from=R40&_trksid=p3907.m38.l1313&_nkw=6J52P&_sacat=See-All-Categories
Kind regards
Karsten
http://shop.ebay.com/?_from=R40&_trksid=p3907.m38.l1313&_nkw=6J52P&_sacat=See-All-Categories
Kind regards
Karsten
kenpeter said:
http://www.medrk.ru/uploads/doc/6zh52p_r&e.pdf
Ok, let's wait 3 days till all people react. Currently 156 peaces are needed.
If you can't pick them up here (BAF for example), prepare to pay for shipment from California.
Wavebourn,
Email sent, count me in for 20, maybe 30 of them.
cheers,
Douglas
here is a potential source too:
http://cgi.ebay.com/Russian-6J52P-L...L?hash=item2c504f1c8c&_trksid=p3286.m63.l1177
Email sent, count me in for 20, maybe 30 of them.
cheers,
Douglas
here is a potential source too:
http://cgi.ebay.com/Russian-6J52P-L...L?hash=item2c504f1c8c&_trksid=p3286.m63.l1177
dsavitsk said:
232 tubes currently. He has about 150 only in stock; it is night there, let's wait till tomorrow, otherwise let's share (one option), or FIFO (2'nd option).
