No a western electric one steve, one of the current spec reissues. There is a EML one going for reasonable money.
Quote from: Hens on November 23, 2010, 11:16:50 AMNo a western electric one steve, one of the current spec reissues. There is a EML one going for reasonable money.Hi Hens.I've had some issues with two EML274B rectifiers (in a preamplifier so they were only used lightly).The first capacitor must be less than 4uf, but more importantly the output impedance of the power transformer must be high.With your DAC unplugged from the mains the rectifier tube removed measure the DC resistance between the two HT wires (pins 2 and 8 ) of the rectifier socket) If this is less than 160 ohms (DCR) use resistors in series with the HT wire to increase the DCR. In my preamps I use 5 watt 100 ohm wire wound on each pin ( 2 & 8 ) to limit the in-rush current. It's a bit of overkill but with a preamp the current draw is quite minimal so there is hardly any voltage drop across the resistors. Another issue with EML I found was warranty. I returned both tubes and sent several emails, in the end they just ignored me, and never sent any replacements. I notice they now have many warnings on their web-page regarding the use of their rectifier tubes.I initially had the rectifier setup with a 2.2uf pio then 10henry choke, another 2.2uf pio followed by a 20h henry choke, then a 47uf electro. Any known rectifier should have coped with this setup as I was only running 275-0-275 vac less than 20ma. Personally I'd go for a 5R4 brown base, or CV417 http://cgi.ebay.com.au/Mullard-5R4GY-274B-CV717-carbon-plates-MINT-suit-Leak-/300495282959?pt=UK_Consumer_VintageAudio_RL&hash=item45f6ea230fCheers, Earle.
I am using vintage U52 brown base black plate in DAC at the moment. It did cost me nearly $200 posted from England though. But so far the best sounding power rect tube I've had in the dac.Are the RCA brown base 5r4gy tubes as good? I'm using 2 of them in my amp..
I recieved an interesting tube today...It has the u52 shape but I believe it predates the u52.... it looks exactly like this oneDoes anyone have any info?
haha, thanks Mario, thats where I linked the pic from, I was just seeing if there was any other info, maybe from someone who may have used one.
Any of you guys bidding on Ebay 250802610743 "U52 / 5U4G BRITISH MILITARY rectifier tube, tested"let us know, don't want to inflate the price if someone really needs it.
type 80 tung sol(need adapter with this one)
Quote from: kajak12 on September 12, 2010, 09:13:36 PMtype 80 tung sol(need adapter with this one)Does anyone have any recommendations about the adapter? Been looking for a good quality one but I'm not sure which one to get.Some adapters I've found so far:1. TS-CM04-08VA (link: http://www.vt4c.com/shop/program/main.php?group_id=6&cat_id=19#202), out of stock at the moment unfortunately2. http://www.ebay.com.au/itm/2PC-Tube-Adapters-8pin-4pin-Ceramic-Gold-Socket-S8C4-/260695267821?pt=Vintage_Electronics_R2&hash=item3cb2a619ed3. http://angela.com/eightpinbottomtofourpintoptubeadapterforrectifiers.aspxThanks,WilliamPS. I am aware about the U52 is the holy grail but I'm on a budget, been using Radiotron 5AS4 (very good and prominent bass) and Tung Sol 5U4G (better midrange, very slightly loose bass compared to 5AS4), I prefer the Tung Sol, spoke to Steven and he recommended type 80, hence looking for an adapter now.