tag:blogger.com,1999:blog-5424814939438798026.post8434981285538536768..comments2022-12-20T10:00:18.436-05:00Comments on JE Labs Arkiv (up to 2008): JE Labs SRPP 45/2A3JEhttp://www.blogger.com/profile/06428836899267344254noreply@blogger.comBlogger8125tag:blogger.com,1999:blog-5424814939438798026.post-4596241662181026552022-03-13T13:48:25.441-04:002022-03-13T13:48:25.441-04:00My Altec 2-way speakers are about 99dB/1W/1M and ~...My Altec 2-way speakers are about 99dB/1W/1M and ~ 2mV of hum from my SE45, 46 and 2A3 (all 2.5VAC filaments) is hardly audible. If you get hum levels greater than that, there might be wiring/grounding issues.<br /><br />I just don't know how that translates to a 105dB speakers.JEhttps://www.blogger.com/profile/06428836899267344254noreply@blogger.comtag:blogger.com,1999:blog-5424814939438798026.post-68328425620738613232022-01-15T19:28:45.218-05:002022-01-15T19:28:45.218-05:00I'll try the ac first, a lot easier to impleme...I'll try the ac first, a lot easier to implement. <br />Thanks again. <br /><br />Ritchie Anonymoushttps://www.blogger.com/profile/16543687288051624939noreply@blogger.comtag:blogger.com,1999:blog-5424814939438798026.post-5536241199258231462022-01-15T15:59:17.574-05:002022-01-15T15:59:17.574-05:00I am using 105db sensitive horn speakers. Do you t...I am using 105db sensitive horn speakers. Do you think ac on the filaments would have low enough hum to not be heard on this sensitive of a speaker?Anonymoushttps://www.blogger.com/profile/16543687288051624939noreply@blogger.comtag:blogger.com,1999:blog-5424814939438798026.post-47133245452650590912022-01-14T09:57:58.445-05:002022-01-14T09:57:58.445-05:00Sounds good.
Thanks very much.Sounds good. <br />Thanks very much.Anonymoushttps://www.blogger.com/profile/16543687288051624939noreply@blogger.comtag:blogger.com,1999:blog-5424814939438798026.post-33087086510808438072022-01-14T08:30:58.480-05:002022-01-14T08:30:58.480-05:00The original circuit works well as-is with a 6SF5....The original circuit works well as-is with a 6SF5. But if you want to compensate for the slightly higher Rp, use a 150k plate load resistor instead of the 100k.<br />JEhttps://www.blogger.com/profile/06428836899267344254noreply@blogger.comtag:blogger.com,1999:blog-5424814939438798026.post-86173442541483715582022-01-14T07:37:15.761-05:002022-01-14T07:37:15.761-05:00Thanks JE, I'll go with the simple 45 for now ...Thanks JE, I'll go with the simple 45 for now as I've been wanting to do it for awhile. I'd like to use a 6sf5 as a driver as I have them in my junk box. Would the existing circuit be ok or should I change the parameters to better match the 6sf5?<br /><br />Ritchie Anonymoushttps://www.blogger.com/profile/16543687288051624939noreply@blogger.comtag:blogger.com,1999:blog-5424814939438798026.post-23394256009288464502022-01-13T11:20:20.014-05:002022-01-13T11:20:20.014-05:00Back in the late 90s, I felt that the Simple 45 pl...Back in the late 90s, I felt that the Simple 45 played more LPs and CDs whereas the SRPP was more audiophile oriented presenting more detail which on long term listening was not as pleasant. However, I had a chance to hear a Morikawa SE 2A3 owned by a friend - https://jelabs.blogspot.com/2014/01/altec-2-way-horn-system-redux.html - I enjoyed listening to this similar hi-mu triode/SRPP input amp! So YMMV!<br /><br />JEJEhttps://www.blogger.com/profile/06428836899267344254noreply@blogger.comtag:blogger.com,1999:blog-5424814939438798026.post-9616334981204089292022-01-12T21:14:59.753-05:002022-01-12T21:14:59.753-05:00How did you find the srpp 45 version vs the simple...How did you find the srpp 45 version vs the simple 45?Anonymoushttps://www.blogger.com/profile/16543687288051624939noreply@blogger.com