tag:blogger.com,1999:blog-2098337119765190876.post4962316055034163925..comments2024-03-28T10:26:22.413+01:00Comments on VinylSavor: Tube of the Month: The EC8020VinylSavorhttp://www.blogger.com/profile/03255472557028244395noreply@blogger.comBlogger15125tag:blogger.com,1999:blog-2098337119765190876.post-4543757682551292792023-01-22T22:23:25.924+01:002023-01-22T22:23:25.924+01:00It was developed in the 1960ies as an attempt to r...It was developed in the 1960ies as an attempt to rival transistors. More coverage here: https://vinylsavor.blogspot.com/2012/05/tube-of-month-ec8020-revisited.htmlAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-2098337119765190876.post-328488474616445632023-01-22T22:17:01.561+01:002023-01-22T22:17:01.561+01:00Very interesting. Insanely expensive now. Any ide...Very interesting. Insanely expensive now. Any idea what the history of this tube is? When did Telefunken start making it?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-2098337119765190876.post-8926524745304216482012-01-04T16:08:55.575+01:002012-01-04T16:08:55.575+01:00Hi Ian,
yes there are plenty of choices. No need ...Hi Ian,<br /><br />yes there are plenty of choices. No need to settle for the most expensive and difficult to find tubes. Luckily I accumulated a small stash of EC8020s over the years. So I use them for the best projects or if people ask me to build my best phonostage for them. I also like the D3A very much and that tube will certainly be covered in a future tube of the month article. From the triode strapped pentodes the E55L seems the most promising from the measurements I did so far. I will use it in a phonostage soon.<br /><br />Best regards<br /><br />ThomasVinylSavorhttps://www.blogger.com/profile/03255472557028244395noreply@blogger.comtag:blogger.com,1999:blog-2098337119765190876.post-49424013378335720632012-01-04T15:36:52.820+01:002012-01-04T15:36:52.820+01:00The little E180F is also not a bad choice, as well...The little E180F is also not a bad choice, as well as EQ80 and EFP60 for low voltage inputs. I love the triode connected D3A for lower impedance input and output with very nice gain. There are many choices and possibilities!<br /><br />Iansoulmerchanthttp://www.diyaudio.com/forums/members/soulmerchant.htmlnoreply@blogger.comtag:blogger.com,1999:blog-2098337119765190876.post-54712751355973711262011-12-29T15:19:19.394+01:002011-12-29T15:19:19.394+01:00Hi Ian,
I have not tried it myself but friends of...Hi Ian,<br /><br />I have not tried it myself but friends of mine. I don't like the horrible spread of the amplification factor it has which requires close matching. I do that with all tubes but with such a spread? If you compare these tubes visually you will notice a big difference in build quality. The anode seems quite coarse compared to the EC8020. For me it is not an alternative. I rather use triode connected E810F, D3A or E55L as alternatives.<br /><br />Best regards<br /><br />ThomasVinylSavorhttps://www.blogger.com/profile/03255472557028244395noreply@blogger.comtag:blogger.com,1999:blog-2098337119765190876.post-51984619018839950642011-12-29T14:52:12.769+01:002011-12-29T14:52:12.769+01:00Hi Thomas,
Ever tried the russian 6S45P-E? It is...Hi Thomas,<br /><br />Ever tried the russian 6S45P-E? It is electrically quite similar and does not seem to be made out of unobtainium...<br /><br />Iansoulmerchanthttp://www.diyaudio.com/forums/members/soulmerchant.htmlnoreply@blogger.comtag:blogger.com,1999:blog-2098337119765190876.post-50029398971639838922011-08-11T08:28:22.036+02:002011-08-11T08:28:22.036+02:00Hi Aster,
yes it is an astonishing tube! I'd ...Hi Aster,<br /><br />yes it is an astonishing tube! I'd rather say the WE437A is close to the EC8020 ;-)<br /><br />ThomasAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-2098337119765190876.post-65889030828131223042011-08-11T03:12:04.108+02:002011-08-11T03:12:04.108+02:00Hi:
Good tube.
Good spec. and spec. close WE...Hi:<br /> Good tube.<br /> Good spec. and spec. close WE437A.<br /> BR,<br /> Asterkao211https://www.blogger.com/profile/06636749243977792845noreply@blogger.comtag:blogger.com,1999:blog-2098337119765190876.post-58086589176710402392011-08-11T03:10:11.593+02:002011-08-11T03:10:11.593+02:00Hi:
Good tube.
Good spec. and spec. close WE...Hi:<br /> Good tube.<br /> Good spec. and spec. close WE437A.<br /> BR,<br /> Asterkao211https://www.blogger.com/profile/06636749243977792845noreply@blogger.comtag:blogger.com,1999:blog-2098337119765190876.post-59996096377089779342011-05-01T18:39:43.755+02:002011-05-01T18:39:43.755+02:00Hi!
the bare parameters won't tell you how th...Hi!<br /><br />the bare parameters won't tell you how the tube actually performs in a preamp. I have tried triode connected pentodes, they are great, but the EC8020 remains my favorite ;-)<br /><br />ThomasVinylSavorhttps://www.blogger.com/profile/03255472557028244395noreply@blogger.comtag:blogger.com,1999:blog-2098337119765190876.post-1650704344779027262011-05-01T18:34:16.518+02:002011-05-01T18:34:16.518+02:00EC8020 is a tad better on transconductance compare...EC8020 is a tad better on transconductance compared to to D3A in triode mode (equivalent noise figure) , apart from transconductance D3A got better mu for a 1st stage in a RIAA - use 2 D3A in parallel if transconductance is an issue, it will still be much cheaper. For my own RIAA I used D3A in a cascoded diff input stage with MAT12 (avoiding 1/f, 1/f^2 noise in JFETs) as input as I don't like transformer step-up for MCAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-2098337119765190876.post-22004278870404489732011-05-01T10:56:19.001+02:002011-05-01T10:56:19.001+02:00Hi!
Yes D3A triode connected have similar charact...Hi!<br /><br />Yes D3A triode connected have similar characteristics. Also E810F and E55L. But the performance of the EC8020 is much better. 6SN7 and similar tubes have much lower transconductance.<br /><br />Best regards ... ThomasVinylSavorhttps://www.blogger.com/profile/03255472557028244395noreply@blogger.comtag:blogger.com,1999:blog-2098337119765190876.post-41393621395104031462011-05-01T10:17:51.901+02:002011-05-01T10:17:51.901+02:00D3A connected as triode is giving similar characte...D3A connected as triode is giving similar characteristics and are more easy to obtain.<br />C3G connected as a triode is also great. Both monument of the post-war best tubes that ever was manufactured (both from Germany). Apart from these the Swedish special 6SN7GT the 33S30A/B are prefoundly good.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-2098337119765190876.post-41701829830403914352011-04-23T10:54:46.141+02:002011-04-23T10:54:46.141+02:00Hi!
... or tube of the decade :-)
In next months ...Hi!<br /><br />... or tube of the decade :-)<br />In next months installment of this series, I'll write about a directly heated tube. I'll probabaly start with my favorite DHT<br /><br />Best regards<br /><br />ThomasVinylSavorhttps://www.blogger.com/profile/03255472557028244395noreply@blogger.comtag:blogger.com,1999:blog-2098337119765190876.post-80906689711740492962011-04-22T21:14:20.065+02:002011-04-22T21:14:20.065+02:00having experience just with EC8010 ,and never havi...having experience just with EC8010 ,and never having single EC8020 .... I can say that EC8020 is probably not tube of the month , but more tube of the year ..... <br /><br />ZMAnonymousnoreply@blogger.com