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7591

  1. oldmustang

    MC225: EL84 with adapter instead of 7591?

    I was looking at what is available in the way of 7591s for my MC225 at Tube Depot today and they had this listing: https://www.tubedepot.com/products/yj7591-el84-to-7591-adapter I'm not dissatisfied with the new manufacture Tung Sol 7591s I'm currently running, and I have a set of NOS with...
  2. kcline

    Sorting Audio Tubes out of a large Radio tube collection

    My partner in all things radio received from the estate of the late Les Goldberg his garage collection of radio tubes, he also got his Hickok 539-C tube tester. Les was a regular at Kutztown every time it was held, he died the Monday after the last Kutztown meet which he did attend but only for...
    • kcline
    • Thread
    • 6550 7189 7591 el-37 tubes
    • Replies: 9
    • Forum: Tube Audio
  3. J

    Scott 340B

    Hi! I have a Scott 340B receiver which has Plate voltage of 450V, screen 430v. i would like to drop the screen to 350v from 430v. Based on the attached schematic, i would need to replace R405 330/2W with a 5k/5W resistor to let 20ma (approx) pass through. Are my calculations correct...
  4. David_NC

    Sherwood S-5000II 7591 Tube Question

    I need a set of 7591's for this amp. EH's are too fat, but it appears that JJ's and Tung-Sols will fit just fine. I have no experience with this tube, so I'm curious as to which ones to get. Any input or recommendations would be appreciated.
    • David_NC
    • Thread
    • 7591 s-5000ii sherwood tung sol tung-sol
    • Replies: 26
    • Forum: Tube Audio
  5. billyz

    HH SCOTT 233 rebuild

    I just took possession of a very nice Scott 233, completely original as far as I could tell. I ran it up on a variac to 117vac , did a few voltage checks and set the bias and balance. Sounded pretty good a bit muddy and blurry and hum. I played it awhile anyway to get a good feel for it. Next I...
    • billyz
    • Thread
    • 299 299c 299d 7591 lk-72 polystyrene recap recapping scott
    • Replies: 32
    • Forum: Tube Audio
  6. H

    Sherwood S-5500 Schematic

    I am looking for a schematic for a Sherwood S-5500 amplifier. This amp has the 7591 output tubes that are horizontally mounted and 5 12AX7 tubes. The rectifier is a voltage doubler. I have looked on google and I can only find the S-5000 schematic and it looks close to this amplifier. Does...
    • Hi-FiGuy
    • Thread
    • 7591 amplifier integrated s-5500 schematic sherwood
    • Replies: 22
    • Forum: Tube Audio
  7. AudioScout

    Tube Replacement Signs

    I have a Scott 380 receiver, and maybe my hearing is getting worse, but I think I am cranking the volume farther to hear the music at the same level I was just the other month. The tuner and phono preamps are also very low, but they have been like that since I've had the receiver. So, what...
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