Going though Mike's stuff anyone know what a BH5 & 6 are?

RE: Going though Mike's stuff anyone know what a BH5 & 6 are?, posted on September 11, 2023 at 15:54:19
Caucasian Blackplate Industry Professional Posts: 8313 Location: Seattle Joined: June 18, 2004	Can you PM me? I would possibly buy all the BH units.

RE: Going though Mike's stuff anyone know what a BH5 & 6 are?, posted on September 11, 2023 at 15:57:08
Paul Joppa Industry Professional Posts: 7320 Location: Seattle, WA Joined: April 23, 2001	Yes, those are proprietary custom designs for upgrading certain Bottlehead products. I take it there were no BH-7's? I'll dig up my notes and post some specs and history shortly. They are very nice designs, but a bit specialized

RE: Going though Mike's stuff anyone know what a BH5 & 6 are?, posted on September 11, 2023 at 18:08:04

Paul Joppa
Industry Professional

Posts: 7320
Location: Seattle, WA
Joined: April 23, 2001

BH-5 is a parafeed output transformer. Basically it's a TFA-2004Jr variant, bobbin wound with Teflon layer separators, in a brass channel frame with solder tabs. Core is a 1.25-inch stack of EI87 laminations, usually made with M4 but occasionally with nickel pinstripes. Primary impedance 3000 ohms, secondary 16 ohms with an 8 ohm tap. The matching plate choke was the BH-7 (about 25 henries at 75mA) and the combination was offered as an upgrade to the Paramount 300B amp.

BH-6 is a plate choke. Based on the BCP-15, it had a paralleled bifilar winding to reduce self-capacitance, as well as the Teflon layer insulation as above. Brass channel frame, core is a 1.0-inch stack of EI75 laminations in M6. Inductance is 40 henries at 50mA, DC resistance 540 ohms. (Note it is NOT suitable for the conventional 250v/60mA/2500 ohm 2A3 operating point.) It was offered as an upgrade to the Paramour II 2A3 amp, paired with a custom 4000-ohm output transformer made by Edcor - I never could talk Mike into making a 4K output transformer.

Both the Paramount and Paramour II have been out of production for a long time now.

RE: Going though Mike's stuff anyone know what a BH5 & 6 are?, posted on September 12, 2023 at 07:14:44
Gordon Rankin Manufacturer Posts: 2941 Joined: June 9, 2000	Paul, Thanks, will look up what else there is. We are just going through the finished items there is a lot of coil stock. Thanks, Gordon J. Gordon Rankin

RE: Going though Mike's stuff anyone know what a BH5 & 6 are?, posted on September 12, 2023 at 07:16:12
Gordon Rankin Manufacturer Posts: 2941 Joined: June 9, 2000	Well you block PM, so you can email me from my site if you want. Thanks, Gordon J. Gordon Rankin

RE: Going though Mike's stuff anyone know what a BH5 & 6 are?, posted on October 12, 2023 at 17:30:39
OldNuke Audiophile Posts: 141 Location: Silicon Valley Joined: November 18, 2014	I will take the TFA 2004's. PM me on the price. Alonzo

RE: Going though Mike's stuff anyone know what a BH5 & 6 are?, posted on October 13, 2023 at 06:04:42
Gordon Rankin Manufacturer Posts: 2941 Joined: June 9, 2000	Sorry they are gone and you lock out PM's so I can't do that. Thanks, Gordon J. Gordon Rankin

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Going though Mike's stuff anyone know what a BH5 & 6 are?

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