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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Re: To Rafe: Do an AA-Tubes Archive search on the 8223/E288CC posted by Rafe on August 24, 2001 at 09:35:25:
Hi Rafe,I think the issue is the fact that the E88CC/6922s (and the E188CC/7308 as well as the E288CC/8223, albeit different) can withstand higher power and voltages than the ECC88/6DJ8.
In circuits which are designed fore and use E88CC/6922 (especially the very resilient Russian variant now marketed by Sovtek) and run them hot, i. e. near their upper power/voltage limit, the ECC88/6DJ8 will not last, and often sound strained.
Now, I recall reading some other posts from Victor K on 6N30P bias points (on AA last year, if my memory does not fail me), he suggests to run them 'hot' - and if he is doing the same for the E88CC/6922 in the BAT amp, the amp would be unreliable with the ECC88/6DJ8. So if I were in his shoes, I would not not recommend people to use the ECC88/6DJ8 either - as it would be calling for trouble.
Now, if a lower absolute amplifcation factor does not matter - it almost never does in line stages, as they usually have too much gain, and if the power supply and circuit had reserves, and be geared towards low valve Rp, I'd see a E288CC/8223 work reasonably well in it. Maybe this is the case for the BAT box - just speculating.
Best regards,
---mb---
======
PS:
(1) The data comparison is in the archive.
(2) If you have interest in DIY, keep the 8223s - they are good valves. Design a linestage around them - switch, step attenuator,
grounded cathode voltage gain stage with two systems in parallel,
and active anode load with output capacitor, or with a 10k:600Ohms
(40 mA) output transformer. That'l do nicely, and will outdo most commercial linestages, if put together well... PSU quality is important.
(3) If your heater transformer has not overheated too much, and it does not smell or hum now, with E188CC/7308 in place, no worries for your equipment. I just once saw the remains of an expensive preamp, where several parallel-operating E88CCs had been replaced by E288CCs - the thing allegedly sounded gorgeous for two hours. Then the transformer started smoking and shorted out. The E288CC heater current apparently overwhelmed it...
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Follow Ups
- ECC88 vs E88CC (6DJ8 vs 6922) - and a case for the 8223 - mb-de 11:40:36 08/24/01 (0)
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