Hi Ian,
Many thanks for that - it must have taken you ages to compile! I've updated the list to include them:
Quote:
- Goodmans (3 bolts): 18 (8 in RP18, 5 in RP25, 1 in AM Herald RP30, 1 in Jonster's AM Herald unnumbered - probably RP30, early RP10, Helsman RP36, Marine Herald RP32)
- Goodmans (no bolts): 11 (My RP25, 1 in AM Herald RP30, 3 AM Heralds RP35, 2 in Helsman RP36, 3 in VHF Herald RP37, 1 in Hunter RP38)
- Celestion (silver frame): 6 (3 in Sovereign RP25, 1 in RP25A, 2 in VHF Herald RP37A)
- Celestion (black frame): 4 (3 in Sovereign RP25B, 1 in VHF Herald RP37A)
- Elac (large magnet): 3 (VHF Herald RP37A)
- Elac (small magnet): 2 (Hunter RP38A)
* The AM Herald RP30 having a no-bolt Goodmans seems a bit anomalous, but this set is incomplete, and it's possibly not the original speaker. More on that when it arrives...
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So your results reinforce my conclusions pretty well - many thanks again.
I would correct my earlier point:
Quote:
- Or, the Goodmans speakers were used exclusively until the advent of the T309 tuner (RP25A and RP37A)?
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It's clear that Hacker started using the Celestion in the RP25
before the tuner change. So far, the data shows that all RP37s have a Goodmans speaker, so I'd be interested to hear from anyone with an RP37 with a Celestion speaker.
Updated conclusions - changes in bold:
- The Goodmans speaker was the "general purpose" model that was used in most models. It is available in two versions: the earlier version had 3 bolts, later ones don't, and it's available in at least two impedances.
- The large magnet Elac was only fitted to RP37A VHF Heralds.
- The Celestions were only fitted to later RP25 Sovereigns and VHF Heralds (probably only RP37A. Later versions had a black chassis.
- An RP25 might have an early Goodmans with bolts, the later Goodmans sans bolts*, or a Celestion! I presume it depends on serial number, along with the usual production variances - trying to drill down further might be going too far
- RP25As and Bs should have the Celestion speaker... There's every chance that speakers in the RP25B sets will have a black frame.
- Finally, the Elac with the small magnet and gold-coloured frame/magnet was fitted to RP38A Hunters, and possibly later models throughout the 1970s (although according to the 1975 brochure, all other sets had a smaller 5 by 7" speaker, but from the pictures I've seen, I'm pretty sure it's still made by Elac).
* The only RP25 I know about with a no-bolts Goodmans is my set. Is my speaker non-original - perhaps they switched straight from bolted-Goodmans to the Celestion?
Thanks as always,
Mark