Tubes Asylum

Mullard E188CC from 1960s are sonically different from 1970s-80s

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In Reply to: RE: A Favorite 6DJ8 is the Equivalent of a Favorite Demon from Hell posted by kathrynatrand@hotmail.com on March 25, 2014 at 15:10:43

As for Mullard/RTC E188CC tubes, it would be useful if you can specify which era.

Sonically, Mullard E188CC tubes from 1960s with Halo Getter(rev dY0)with designations such as E188CC CV4108 CV4110 and CV4109 are more closer to Philips Heerlen E188CC versus dimple disk Mullard E188CC/CV4108 from 1970s-1980s.

1960S Mullard E188CC tubes are more refined in midrange and balanced overall.
Mullard CV4110 Mitcham halo getter rev dY0 (Open in New Window)

Follow Ups:

RE: Mullard E188CC from 1960s are sonically different from 1970s-80s - kathrynatrand@hotmail.com 10:11:52 03/27/14 (1)
That would be my last tube power simplifier. Just not into the bigger tubes anymore/
- RE: Mullard E188CC from 1960s are sonically different from 1970s-80s - kathrynatrand@hotmail.com 10:13:19 03/27/14 (0)
  I purchased them from a TV repair store, which had most all tubes for anything, and the time was 1965-1967, I guess one can be sure, unless there were same time travel tubes, must were made when, or before I purchased them. They were purchased in France.
  
  As far as I know, the RTC tubes I purchased 1964-1967, were all before 1968, I sure Most were used, like Mazda, in broadcasting, and some for industrial products and a few radio enthusiasts.
  
  Most for audio were the 12AX7, 12AT7, 12AU7, 12AU7S were used by musicians, 12AX7 was used in some audio, but really,more the one with higher mu. I do not remember any of the 6922 being used in preamp that much and why I have them is somewhat coincidence?
  
  I first began using them when some older amps needed new tubes, and later, with ARC, I changed out all those Russian tubes they use with Siemans, Mullard and some Philips/ Amperex none purchased after 1970.
Learned something new everyday.... - FrankC 16:04:42 03/26/14 (1)
I've dismissed the Mullard tubes after spending some times with their ECC88 and some EL84 tubes and finding all of them sounding thick in the midrange but not much extension on the upper range, and cotrol at the bottom octaves.

I have some CV2493s, Halo E88CCs and ECC88s that I had purchased years ago but never listened to. I think I will give these a try.

FrankC
- RE: Learned something new everyday.... - kathrynatrand@hotmail.com 10:25:01 03/27/14 (0)
  Most is tubes I owned were E88CC, or E188CC
  THe Siemens E88CC A frame are good, but I do not know what people mean about A1 vs A6 numbers, mine are A1, whet whether that is good or not ?
  The Mulland I have are actually RTC made my Mullard and are E188CC, these sound war,er to me, but not as dynamic as the Siemens.
  I understand the E identification much better then the all numbers, which I think is USA?
  I think Philips SQ are the same as Amperex PQ when made in Holland? Generally the older one are better, but the orange label are very fine.
  
  Edits: 03/27/14

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